LittleNellie/cipherscan
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cipherscan/cipherscan

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#!/usr/bin/env bash
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# Author: Julien Vehent [:ulfr] - 2013
DOBENCHMARK=0
BENCHMARKITER=30
OPENSSLBIN="$(dirname $0)/openssl"
TIMEOUT=10
CIPHERSUITE="ALL:COMPLEMENTOFALL"
VERBOSE=0
ALLCIPHERS=0
OUTPUTFORMAT="terminal"
REQUEST="GET / HTTP/1.1
Host: $TARGET
Connection: close
"
usage() {
echo -e "usage: $0 [-a|--allciphers] [-b|--benchmark] [-j|--json] [-v|--verbose] [-o|--openssl file] [openssl s_client args] <target:port>
usage: $0 -h|--help
$0 attempts to connect to a target site using all the ciphersuites it knowns.
Julien Vehent [:ulfr] - https://github.com/jvehent/cipherscan
Port defaults to 443
example: $ $0 www.google.com:443
Use one of the options below:
-a | --allciphers Test all known ciphers individually at the end.
-b | --benchmark Activate benchmark mode.
-h | --help Shows this help text.
-j | --json Output results in JSON format.
-o | --openssl path/to/your/openssl binary you want to use.
-v | --verbose Increase verbosity.
The rest of the arguments will be interpreted as openssl s_client argument.
This enables checking smtp/imap/pop3/ftp/xmpp via -starttls
EXAMPLES: $0 -starttls xmpp jabber.ccc.de:5222
"
}
verbose() {
if [ $VERBOSE != 0 ];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=$(mktemp "/tmp/cipherscan.XXXXXXXX") # OS X mktemp requires this.
# echo "$sslcommand $tls_version"
$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" || "$current_cipher" == '(NONE)' ]]; then
# connection failed, try again with next TLS version
rm "$tmp"
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='echo "quit\n" | $OPENSSLBIN s_client $SCLIENTARGS -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/$BENCHMARKITER))"
}
# Connect to the target and retrieve the chosen cipher
# recursively until the connection fails
get_cipher_pref() {
[ "$OUTPUTFORMAT" == "terminal" ] && echo -n '.'
local ciphersuite="$1"
local sslcommand="$OPENSSLBIN s_client $SCLIENTARGS -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:$ciphersuite"
return 0
fi
}
display_results_in_terminal() {
# Display the results
ctr=1
for cipher in "${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 $result|grep -v '(NONE)'
done|column -t
}
display_results_in_json() {
# Display the results in json
ctr=0
echo -n "{\"target\":\"$TARGET\",\"date\":\"$(date -R)\",\"ciphersuite\": ["
for cipher in "${cipherspref[@]}"; do
[ $ctr -gt 0 ] && echo -n ','
echo -n "{\"cipher\":\"$(echo $cipher|awk '{print $1}')\","
echo -n "\"protocols\":[\"$(echo $cipher|awk '{print $2}'|sed 's/,/","/g')\"],"
pfs=$(echo $cipher|awk '{print $3}')
[ "$pfs" == "" ] && pfs="None"
echo -n "\"pfs\":\"$pfs\"}"
ctr=$((ctr+1))
done
echo ']}'
}
# UNKNOWNOPTIONS=""
while :
do
case $1 in
-h | --help | -\?)
usage
exit 0 # This is not an error, User asked help. Don't do "exit 1"
;;
-o | --openssl)
OPENSSLBIN=$2 # You might want to check if you really got FILE
shift 2
;;
-a | --allciphers)
ALLCIPHERS=1
shift
;;
-v | --verbose)
# Each instance of -v adds 1 to verbosity
VERBOSE=$((VERBOSE+1))
shift
;;
-j | -json | --json | --JSON)
OUTPUTFORMAT="json"
shift
;;
-b | --benchmark)
DOBENCHMARK=1
shift
;;
--) # End of all options
shift
break
;;
# -*)
# UNKNOWNOPTIONS=$((UNKNOWNOPTIONS+$1))
# # echo "WARN: Unknown option (ignored): $1" >&2
# shift
# ;;
*) # no more options we understand.
break
;;
esac
done
if [ VERBOSE != 0 ] ; then
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
#[[ -z $1 || "$1" == "-h" || "$1" == "--help" ]] && usage
# if [ ! -z $2 ]; then
# if [ "$1" == "-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
# elif [ "$1" == "-a" ]; then
# ALLCIPHERS=1
# elif [ "$1" == "-json" ]; then
# OUTPUTFORMAT="json"
# fi
# fi
# echo paramters left: $@
TEMPTARGET=$(sed -e 's/^.* //'<<<"${@}")
HOST=$(sed -e 's/:.*//'<<<"${TESTTARGET}")
PORT=$(sed -e 's/.*://'<<<"${TESTTARGET}")
# Default to https if no port given
if [ "$HOST" = "$PORT" ]; then
PORT=443
fi
# echo host: $HOST
# echo port: $PORT
TARGET=$HOST:$PORT
# echo target: $TARGET
SCLIENTARGS=$(sed -e s,${TEMPTARGET},,<<<"${@}")
# echo sclientargs: $SCLIENTARGS
cipherspref=();
results=()
# Call to the recursive loop that retrieves the cipher preferences
get_cipher_pref $CIPHERSUITE
if [ "$OUTPUTFORMAT" == "json" ]; then
display_results_in_json
else
echo
display_results_in_terminal
fi
# If asked, test every single cipher individually
if [ $ALLCIPHERS -gt 0 ]; then
echo; echo "All accepted ciphersuites"
for c in $($OPENSSLBIN ciphers -v ALL:COMPLEMENTOFALL 2>/dev/null |awk '{print $1}'|sort|uniq); do
r="fail"
osslcommand='echo "quit\n" | $OPENSSLBIN s_client $SCLIENTARGS -connect $TARGET -cipher $c'
test_cipher_on_target "$osslcommand"
if [ $? -eq 0 ]; then
r="pass"
fi
echo "$c $r"|awk '{printf "%-35s %s\n",$1,$2}'
done
fi
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