cipherscan/CiphersScan.sh
2013-11-20 10:47:23 -05:00

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#!/usr/bin/env bash
DOBENCHMARK=0
BENCHMARKITER=30
OPENSSLBIN="./openssl"
#OPENSSLBIN="/usr/bin/openssl"
TIMEOUT=10
CIPHERSUITE="ALL:COMPLEMENTOFALL"
REQUEST="GET / HTTP/1.1
Host: $TARGET
"
verbose() {
if [ $VERBOSE -eq 1 ];then
echo $@
fi
}
# Connect to a target host with the selected ciphersuite
test_cipher_on_target() {
local sslcommand=$@
cipher=""
protocols=""
pfs=""
for tls_version in "-ssl2" "-ssl3" "-tls1" "-tls1_1" "-tls1_2"
do
local tmp=$(mktemp)
$sslcommand $tls_version 1>"$tmp" 2>/dev/null << EOF
$REQUEST
EOF
current_cipher=$(grep "New, " $tmp|awk '{print $5}')
current_pfs=$(grep 'Server Temp Key' $tmp|awk '{print $4$5$6$7}')
current_protocol=$(grep -E "^\s+Protocol\s+:" $tmp|awk '{print $3}')
if [[ -z "$current_protocol" || "$current_cipher" == '(NONE)' ]]; then
# connection failed, try again with next TLS version
continue
fi
# connection succeeded, add TLS version to positive results
if [ -z "$protocols" ]; then
protocols=$current_protocol
else
protocols="$protocols,$current_protocol"
fi
cipher=$current_cipher
pfs=$current_pfs
# grab the cipher and PFS key size
rm "$tmp"
done
# if cipher is empty, that means none of the TLS version worked with
# the current cipher
if [ -z "$cipher" ]; then
verbose "handshake failed, no ciphersuite was returned"
result='ConnectionFailure'
return 2
# if cipher contains NONE, the cipher wasn't accepted
elif [ "$cipher" == '(NONE) ' ]; then
result="$cipher $protocols $pfs"
verbose "handshake failed, server returned ciphersuite '$result'"
return 1
# the connection succeeded
else
result="$cipher $protocols $pfs"
verbose "handshake succeeded, server returned ciphersuite '$result'"
return 0
fi
}
# Calculate the average handshake time for a specific ciphersuite
bench_cipher() {
local ciphersuite="$1"
local sslcommand="timeout $TIMEOUT $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
if [ $? -gt 0 ]; then
break
fi
done
# Time interval in nanoseconds
local t="$(($(date +%s%N) - t))"
verbose "Benchmarking done in $t nanoseconds"
# Microseconds
cipherbenchms="$((t/1000/$BENCHMARKITER))"
}
# Connect to the target and retrieve the chosen cipher
# recursively until the connection fails
get_cipher_pref() {
echo -n '.'
local ciphersuite="$1"
local sslcommand="timeout $TIMEOUT $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[@]}" "$result")
pciph=$(echo $result|awk '{print $1}')
get_cipher_pref "!$pciph:$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
ALLCIPHERS=0
if [ ! -z $2 ]; then
if [ "$2" == "-v" ]; then
VERBOSE=1
echo "Loading $($OPENSSLBIN ciphers -v $CIPHERSUITE 2>/dev/null|grep Kx|wc -l) ciphersuites from $(echo -n $($OPENSSLBIN version 2>/dev/null))"
$OPENSSLBIN ciphers ALL 2>/dev/null
fi
if [ "$2" == "-a" ]; then
ALLCIPHERS=1
fi
fi
cipherspref=();
results=()
# Call to the recursive loop that retrieves the cipher preferences
get_cipher_pref $CIPHERSUITE
echo
# Display the results
ctr=1
for cipher in "${cipherspref[@]}"; do
pciph=$(echo $cipher|awk '{print $1}')
if [ $DOBENCHMARK -eq 1 ]; then
bench_cipher "$pciph"
r="$ctr $cipher $cipherbenchms"
else
r="$ctr $cipher"
fi
results=("${results[@]}" "$r")
ctr=$((ctr+1))
done
if [ $DOBENCHMARK -eq 1 ]; then
header="prio ciphersuite protocols pfs_keysize avg_handshake_microsec"
else
header="prio ciphersuite protocols pfs_keysize"
fi
ctr=0
for result in "${results[@]}"; do
if [ $ctr -eq 0 ]; then
echo $header
ctr=$((ctr+1))
fi
echo $result|grep -v '(NONE)'
done|column -t
if [ $ALLCIPHERS -gt 0 ]; then
echo; echo "All accepted ciphersuites"
for cipher in $($OPENSSLBIN ciphers -v ALL:COMPLEMENTOFALL 2>/dev/null |awk '{print $1}'|sort|uniq); do
osslcommand="timeout $TIMEOUT $OPENSSLBIN s_client -connect $TARGET -cipher $cipher"
test_cipher_on_target "$osslcommand"
r=$?
if [ $r -eq 0 ]; then
echo -en '\E[40;32m'"OK"; tput sgr0
else
echo -en '\E[40;31m'"KO"; tput sgr0
fi
echo " $cipher"
done
fi