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cipherscan/cipherscan
Julien Vehent a966574edc Fix curve fallback detection
2015-04-01 14:51:01 -04:00

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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/.
# Authors: Julien Vehent [:ulfr] - 201{3,4}
# Hubert Kario - 2014
# vim: autoindent tabstop=4 shiftwidth=4 expandtab softtabstop=4 filetype=sh
DOBENCHMARK=0
BENCHMARKITER=30
REALPATH=$(dirname $0)
# make sure this doesn't error out when readlink -f isn't available (OSX)
readlink -f $0 &>/dev/null && REALPATH=$(dirname $(readlink -f $0))
OPENSSLBIN="${REALPATH}/openssl"
if [ "$(uname -s)" == "Darwin" ]; then
OPENSSLBIN="${REALPATH}/openssl-darwin64"
fi
# cipherscan requires bash4, which doesn't come by default in OSX
if [ ${BASH_VERSINFO[0]} -lt 4 ]; then
echo "Bash version 4 is required to run cipherscan."
echo "Please upgrade your version of bash (ex: brew install bash)."
exit 1
fi
# test that timeout or gtimeout (darwin) are present
TIMEOUTBIN="$(which timeout)"
if [ "$TIMEOUTBIN" == "" ]; then
TIMEOUTBIN="$(which gtimeout)"
if [ "$TIMEOUTBIN" == "" ]; then
echo "neither timeout nor gtimeout are present. install coreutils with {apt-get,yum,brew} install coreutils"
exit 1
fi
fi
# find a list of trusted CAs on the local system, or use the provided list
if [ -z "$CACERTS" ]; then
for f in /etc/pki/tls/certs/ca-bundle.crt /etc/ssl/certs/ca-certificates.crt; do
if [ -e "$f" ]; then
CACERTS="$f"
break
fi
done
fi
if [ ! -e "$CACERTS" ]; then
CACERTS="$(dirname $0)/ca-bundle.crt"
fi
# RSA ciphers are put at the end to force Google servers to accept ECDSA ciphers
# (probably a result of a workaround for the bug in Apple implementation of ECDSA)
CIPHERSUITE="ALL:COMPLEMENTOFALL:+aRSA"
DEBUG=0
VERBOSE=0
DELAY=0
ALLCIPHERS=0
OUTPUTFORMAT="terminal"
TIMEOUT=30
# place where to put the found intermediate CA certificates and where
# trust anchors are stored
CAPATH=""
SAVECRT=""
TEST_CURVES="False"
has_curves="False"
# openssl formated list of curves that will cause server to select ECC suite
ecc_ciphers=""
unset known_certs
declare -A known_certs
unset cert_checksums
declare -A cert_checksums
# because running external commands like sleep incurs a fork penalty, we
# first check if it is necessary
ratelimit() {
if [[ $DELAY != "0" ]]; then
sleep $DELAY
fi
}
usage() {
echo -e "usage: $0 [-a|--allciphers] [-b|--benchmark] [--capath directory]
[--saveca] [--savecrt directory] [-d|--delay seconds] [-D|--debug] [-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 knows.
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.
--capath use CAs from directory (must be in OpenSSL CAdir format)
--saveca save intermediate certificates in CA directory
-d | --delay Pause for n seconds between connections
-D | --debug Output ALL the information.
-h | --help Shows this help text.
-j | --json Output results in JSON format.
-o | --openssl path/to/your/openssl binary you want to use.
--savecrt path where to save untrusted and leaf certificates
--[no-]curves test ECC curves supported by server (req. OpenSSL 1.0.2)
-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 [ $VERBOSE != 0 ]; then
echo "$@" >&2
fi
}
debug(){
if [ $DEBUG == 1 ]; then
echo Debug: "$@" >&2
set -evx
fi
}
# obtain an array of curves supported by openssl
CURVES=(sect163k1 # K-163
sect163r1
sect163r2 # B-163
sect193r1
sect193r2
sect233k1 # K-233
sect233r1 # B-233
sect239k1
sect283k1 # K-283
sect283r1 # B-283
sect409k1 # K-409
sect409r1 # B-409
sect571k1 # K-571
sect571r1 # B-571
secp160k1
secp160r1
secp160r2
secp192k1
prime192v1 # P-192 secp192r1
secp224k1
secp224r1 # P-224
secp256k1
prime256v1 # P-256 secp256r1
secp384r1 # P-384
secp521r1 # P-521
brainpoolP256r1
brainpoolP384r1
brainpoolP512r1)
# many curves have alternative names, this array provides a mapping to find the IANA
# name of a curve using its alias
CURVES_MAP=("sect163k1 K-163"
"sect163r2 B-163"
"sect233k1 K-233"
"sect233r1 B-233"
"sect283k1 K-283"
"sect283r1 B-283"
"sect409k1 K-409"
"sect409r1 B-409"
"sect571k1 K-571"
"sect571r1 B-571"
"prime192v1 P-192 secp192r1"
"secp224r1 P-224"
"prime256v1 P-256 secp256r1"
"secp384r1 P-384"
"secp521r1 P-521")
get_curve_name() {
local identifier=$1
for c in "${CURVES_MAP[@]}"; do
if [[ "$c" =~ $identifier ]]; then
verbose "$c matches identifier $identifier"
local map=(${c// / })
echo ${map[0]}
return
fi
done
echo $identifier
return
}
c_hash() {
local h=$(${OPENSSLBIN} x509 -hash -noout -in "$1/$2" 2>/dev/null)
for ((num=0; num<=100; num++)) ; do
if [[ $1/${h}.${num} -ef $2 ]]; then
# file already linked, ignore
break
fi
if [[ ! -e $1/${h}.${num} ]]; then
# file doesn't exist, create a link
pushd "$1" > /dev/null
ln -s "$2" "${h}.${num}"
popd > /dev/null
break
fi
done
}
parse_openssl_output() {
# clear variables in case matching doesn't hit them
current_ocspstaple="False"
current_cipher=""
current_pfs=""
current_protocol=""
current_tickethint="None"
current_pubkey=0
current_trusted="False"
current_sigalg="None"
certs_found=0
current_raw_certificates=()
while read line; do
# check if there isn't OCSP response data (response and responder cert)
if [[ $line =~ ^====================================== ]]; then
while read data; do
# check if there is a OCSP response in output
if [[ $data =~ OCSP\ Response\ Data ]]; then
current_ocspstaple="True"
continue
fi
# skip all data from a OCSP response
if [[ $data =~ ^====================================== ]]; then
break
fi
done
continue
fi
# extract selected cipher
if [[ $line =~ New,\ ]]; then
local match=($line)
current_cipher="${match[4]}"
continue
fi
# extract data about selected temporary key
if [[ $line =~ Server\ Temp\ Key ]]; then
local match=($line)
current_pfs="${match[3]}${match[4]}${match[5]}${match[6]}"
continue
fi
# extract used protocol
if [[ $line =~ ^Protocol\ + ]]; then
local match=($line)
current_protocol="${match[2]}"
continue
fi
# extract session ticket hint
if [[ $line =~ ticket\ lifetime\ hint ]]; then
local match=($line)
current_tickethint="${match[5]}"
continue
fi
# extract size of server public key
if [[ $line =~ Server\ public\ key\ is\ ]]; then
local match=($line)
current_pubkey="${match[4]}"
continue
fi
# check if connection used trused certificate
if [[ $line =~ Verify\ return\ code:\ 0 ]]; then
current_trusted="True"
continue
fi
# extract certificates
if [[ $line =~ -----BEGIN\ CERTIFICATE----- ]]; then
current_raw_certificates[$certs_found]="$line"$'\n'
while read data; do
current_raw_certificates[$certs_found]+="$data"$'\n'
if [[ $data =~ -----END\ CERTIFICATE----- ]]; then
break
fi
done
certs_found=$((certs_found+1))
continue
fi
done
# if we found any certs in output, process the first one and extract
# the signature algorithm on it (it's the server's certificate)
if [[ $certs_found -gt 0 ]]; then
local ossl_out=$(${OPENSSLBIN} x509 -noout -text 2>/dev/null <<<"${current_raw_certificates[0]}")
while read data; do
if [[ $data =~ Signature\ Algorithm ]]; then
local match=($data)
current_sigalg="${match[2]}"
fi
done <<<"$ossl_out"
fi
}
# Connect to a target host with the selected ciphersuite
test_cipher_on_target() {
local sslcommand=$@
cipher=""
local cmnd=""
protocols=""
pfs=""
previous_cipher=""
certificates=""
for tls_version in "-ssl2" "-ssl3" "-tls1" "-tls1_1" "-tls1_2"
do
# sslv2 client hello doesn't support SNI extension
# in SSLv3 mode OpenSSL just ignores the setting so it's ok
# -status exception is ignored in SSLv2, go figure
if [ "$tls_version" == "-ssl2" ]; then
if [[ "$sslcommand" =~ (.*)(-servername\ [^ ]*)(.*) ]]; then
cmnd="${BASH_REMATCH[1]} ${BASH_REMATCH[3]}"
else
cmnd="$sslcommand"
fi
else
cmnd=$sslcommand
fi
ratelimit
debug echo \"Q\" \| $cmnd $tls_version
local tmp=$(echo "Q" | $cmnd $tls_version 1>/dev/stdout 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "selected cipher is '$current_cipher'"
verbose "using protocol '$current_protocol'"
# collect certificate data
current_certificates=""
local certificate_count=$certs_found
debug "server presented $certificate_count certificates"
local i
for ((i=0; i<$certificate_count; i=i+1 )); do
# extract i'th certificate
local cert="${current_raw_certificates[$i]}"
# put the output to an array instead running awk '{print $1}'
local cksum=($(cksum <<<"$cert"))
# compare the values not just checksums so that eventual collision
# doesn't mess up results
if [[ ${known_certs[$cksum]} == $cert ]]; then
if [ -n "${current_certificates}" ]; then
current_certificates+=","
fi
current_certificates+="\"${cert_checksums[$cksum]}\""
continue
fi
# compute sha256 fingerprint of the certificate
local sha256sum=($(${OPENSSLBIN} x509 -outform DER\
<<<"$cert" 2>/dev/null |\
${OPENSSLBIN} dgst -sha256 -r 2>/dev/null))
# check if it is a CA certificate
local isCA="False"
if ${OPENSSLBIN} x509 -noout -text <<<"$cert" 2>/dev/null |\
grep 'CA:TRUE' >/dev/null; then
isCA="True"
fi
# build trust source for certificate verification
local trust_source=()
if [[ -n $CAPATH ]]; then
trust_source=("-CApath" "$CAPATH")
elif [[ -e $CACERTS ]]; then
trust_source=("-CAfile" "$CACERTS")
fi
# check if the certificate is actually trusted (server may present
# unrelated certificates that are not trusted (including self
# signed ones)
local saved="False"
if ${OPENSSLBIN} verify "${trust_source[@]}" \
-untrusted <(printf "%s" "${current_raw_certificates[@]}") <(echo "$cert") 2>/dev/null | \
grep ': OK$' >/dev/null; then
# if the certificate is an intermediate CA it may be useful
# for connecting to servers that are misconfigured so save it
if [[ -n $CAPATH ]] && [[ $SAVECA == "True" ]] && [[ $isCA == "True" ]]; then
if [[ ! -e "$CAPATH/${sha256sum}.pem" ]]; then
echo "$cert" > "$CAPATH/${sha256sum}.pem"
c_hash "$CAPATH" "${sha256sum}.pem"
fi
saved="True"
fi
fi
if [[ -n $SAVECRT ]] && [[ $saved == "False" ]]; then
if [[ ! -e $SAVECRT/${sha256sum}.pem ]]; then
echo "$cert" > "$SAVECRT/${sha256sum}.pem"
fi
fi
# save the sha sum for reporting
if [ -n "${current_certificates}" ]; then
current_certificates+=","
fi
current_certificates+="\"${sha256sum}\""
known_certs[$cksum]="$cert"
cert_checksums[$cksum]="$sha256sum"
done
debug "current_certificates: $current_certificates"
# parsing finished, report result
if [[ -z "$current_protocol" || "$current_cipher" == '(NONE)' ]]; then
# connection failed, try again with next TLS version
continue
else
verbose "connection successful; protocol: $current_protocol, cipher: $current_cipher, previous cipher: $previous_cipher"
fi
# handling of TLSv1.2 only cipher suites
if [ ! -z "$previous_cipher" ] && [ "$previous_cipher" != "$current_cipher" ] && [ "$current_cipher" != "0000" ]; then
unset protocols
fi
previous_cipher=$current_cipher
# 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
[ -z $pfs ] && pfs="None"
pubkey=$current_pubkey
sigalg=$current_sigalg
trusted=$current_trusted
tickethint=$current_tickethint
ocspstaple=$current_ocspstaple
certificates="$current_certificates"
# grab the cipher and PFS key size
done
# if cipher is empty, that means none of the TLS version worked with
# the current cipher
if [ -z "$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 $pubkey $sigalg $trusted $tickethint $ocspstaple $pfs $current_curves $curves_ordering"
verbose "handshake failed, server returned ciphersuite '$result'"
return 1
# the connection succeeded
else
current_curves="None"
# if pfs uses ECDH, test supported curves
if [[ $pfs =~ ECDH ]]; then
has_curves="True"
if [ $TEST_CURVES == "True" ]; then
test_curves
if [ "$ecc_ciphers" != "" ]; then
ecc_ciphers+=":"
fi
ecc_ciphers+="$cipher"
else
# resolve the openssl curve to the proper IANA name
current_curves="$(get_curve_name $(echo $pfs|cut -d ',' -f2))"
fi
fi
result="$cipher $protocols $pubkey $sigalg $trusted $tickethint $ocspstaple $pfs $current_curves $curves_ordering"
verbose "handshake succeeded, server returned ciphersuite '$result'"
return 0
fi
}
# Calculate the average handshake time for a specific ciphersuite
bench_cipher() {
local ciphersuite="$1"
local sslcommand="$TIMEOUTBIN $TIMEOUT $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
debug Connection $i
(echo "Q" | $sslcommand 2>/dev/null 1>/dev/null)
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" ] && [ $DEBUG -lt 1 ] && echo -n '.'
local ciphersuite="$1"
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e $CACERTS ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" -status $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[@]}" "$result")
ciphercertificates=("${ciphercertificates[@]}" "$certificates")
pciph=($result)
get_cipher_pref "!$pciph:$ciphersuite"
return 0
fi
}
display_results_in_terminal() {
# Display the results
ctr=1
local pubkey
local sigalg
local trusted
local tickethint
local ocspstaple
local curvesordering
local different=False
echo "Target: $TARGET"; echo
for cipher in "${cipherspref[@]}"; do
# get first in array
pciph=($cipher)
if [ $DOBENCHMARK -eq 1 ]; then
bench_cipher "$pciph"
r="$ctr $cipher $cipherbenchms"
else
r="$ctr $cipher"
fi
local cipher_data=($cipher)
if [ $ctr -eq 1 ]; then
pubkey="${cipher_data[2]}"
sigalg="${cipher_data[3]}"
trusted="${cipher_data[4]}"
tickethint="${cipher_data[5]}"
ocspstaple="${cipher_data[6]}"
if [[ $TEST_CURVES == "True" && "${cipher_data[9]}" != "" ]]; then
curvesordering="${cipher_data[9]}"
fi
else
if [ "$pubkey" != "${cipher_data[2]}" ]; then
different=True
fi
if [ "$sigalg" != "${cipher_data[3]}" ]; then
different=True
fi
if [ "$trusted" != "${cipher_data[4]}" ]; then
different=True
fi
if [ "$tickethint" != "${cipher_data[5]}" ]; then
different=True
fi
if [ "$ocspstaple" != "${cipher_data[6]}" ]; then
different=True
fi
if [[ "$curvesordering" == "" && "${cipher_data[9]}" != "" ]]; then
curvesordering="${cipher_data[9]}"
fi
if [[ "$curvesordering" != "" && "$curvesordering" != "${cipher_data[9]}" ]]; then
different=True
fi
fi
results=("${results[@]}" "$r")
ctr=$((ctr+1))
done
header="prio ciphersuite protocols"
if [ $different == "True" ]; then
header+=" pubkey_size signature_algoritm trusted ticket_hint ocsp_staple"
fi
header+=" pfs"
if [ $has_curves == "True" ]; then
header+=" curves"
if [[ $TEST_CURVES == "True" && $different == "True" ]]; then
header+=" curves_ordering"
fi
fi
if [ $DOBENCHMARK -eq 1 ]; then
header+=" avg_handshake_microsec"
fi
ctr=0
for result in "${results[@]}"; do
if [ $ctr -eq 0 ]; then
echo $header
ctr=$((ctr+1))
fi
if [ $different == "True" ]; then
echo $result|grep -v '(NONE)'
else
# prints priority, ciphersuite, protocols and pfs
awk '!/(NONE)/{print $1 " " $2 " " $3 " " $9 " " $10}' <<<"$result"
fi
done|column -t
echo
if [ $different != "True" ]; then
if [ "$trusted" == "True" ]; then
echo "Certificate: trusted, $pubkey bit, $sigalg signature"
else
echo "Certificate: UNTRUSTED, $pubkey bit, $sigalg signature"
fi
echo "TLS ticket lifetime hint: $tickethint"
fi
if [[ $ocspstaple == "True" ]]; then
echo "OCSP stapling: supported"
else
echo "OCSP stapling: not supported"
fi
if [[ $serverside == "True" ]]; then
echo "Cipher ordering: server"
else
echo "Cipher ordering: client"
fi
if [ $TEST_CURVES == "True" ]; then
echo "Curves ordering: $curvesordering"
echo "Curves fallback: $fallback_supported"
fi
}
display_results_in_json() {
# Display the results in json
ctr=0
echo -n "{\"target\":\"$TARGET\",\"utctimestamp\":\"$(date -u '+%FT%T.0Z')\",\"serverside\":\"${serverside}\",\"ciphersuite\": ["
for cipher in "${cipherspref[@]}"; do
local cipher_arr=($cipher)
[ $ctr -gt 0 ] && echo -n ','
echo -n "{\"cipher\":\"${cipher_arr[0]}\","
echo -n "\"protocols\":[\"${cipher_arr[1]//,/\",\"}\"],"
echo -n "\"pubkey\":[\"${cipher_arr[2]//,/\",\"}\"],"
echo -n "\"sigalg\":[\"${cipher_arr[3]//,/\",\"}\"],"
echo -n "\"trusted\":\"${cipher_arr[4]//,/\",\"}\","
if [[ -n $CAPATH ]]; then
echo -n "\"certificates\":[${ciphercertificates[$ctr]}],"
fi
echo -n "\"ticket_hint\":\"${cipher_arr[5]}\","
echo -n "\"ocsp_stapling\":\"${cipher_arr[6]}\","
pfs="${cipher_arr[7]}"
[ "$pfs" == "" ] && pfs="None"
echo -n "\"pfs\":\"$pfs\""
if [[ "${cipher_arr[0]}" =~ ECDH ]]; then
echo -n ","
echo -n "\"curves\":[\"${cipher_arr[8]//,/\",\"}\"]"
if [ $TEST_CURVES == "True" ]; then
echo -n ","
echo -n "\"curves_ordering\":\"${cipher_arr[9]}\""
fi
fi
echo -n "}"
ctr=$((ctr+1))
done
echo -n ']'
if [ $TEST_CURVES == "True" ]; then
echo -n ",\"curves_fallback\":\"$fallback_supported\""
fi
echo '}'
}
test_serverside_ordering() {
local ciphersuite=""
local prefered=""
# server supports only one cipher or no ciphers, so it effectively uses server side ordering...
if [[ ${#cipherspref[@]} -lt 2 ]]; then
serverside="True"
return 0
# server supports just two ciphers, so rotate them, that should be enough
elif [[ ${#cipherspref[@]} -eq 2 ]]; then
local cipher=(${cipherspref[1]})
prefered="$cipher"
ciphersuite=$cipher
cipher=(${cipherspref[0]})
ciphersuite+=":$cipher"
# server supports 3 or more ciphers, rotate all three. This is necessary because google does
# select first client provided cipher, if it is either CDHE-RSA-AES128-GCM-SHA256 or
# ECDHE-RSA-CHACHA20-POLY1305
else
local cipher=(${cipherspref[2]})
prefered="$cipher"
ciphersuite="$cipher"
cipher=(${cipherspref[1]})
ciphersuite+=":$cipher"
cipher=(${cipherspref[0]})
ciphersuite+=":$cipher"
fi
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" -status $SCLIENTARGS -connect $TARGET -cipher $ciphersuite"
test_cipher_on_target "$sslcommand"
if [ $? -ne 0 ]; then
serverside="True"
else
local selected=($result)
if [[ $selected == $prefered ]]; then
serverside="False"
else
serverside="True"
fi
fi
}
test_curves() {
# "True" if server supports ciphers that don't use ECC at a lower priority
local fallback_available="False"
# return variable: list of curves supported by server, in order
current_curves=""
# return variable: check if server uses server side or client side ordering
# for curves
curves_ordering="server"
local curves=(${CURVES[*]})
OLDIFS="$IFS"
IFS=':'
verbose "Will test following curves: ${curves[*]}"
IFS="$OLDIFS"
# prepare the ssl command we'll be using
local sslcommand=""
sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" -status $SCLIENTARGS -connect $TARGET -cipher $current_cipher"
# force the TLS to send a TLS1.0 client hello at least, as with SSLv2
# ciphers present it will try to send a SSLv2 compatible client hello
sslcommand+=" -no_ssl2 -no_ssl3"
#
# here we use the same logic as with detecting cipher suites: first
# advertise all curves as supported, then remove curves one by one until we
# either get a fallback to a non ECC cipher, we run of curves or server
# tries to negotiate a curve we didn't advertise
#
while [[ ${#curves[@]} -gt 0 ]]; do
OLDIFS="$IFS"
IFS=':'
local test_curves="${curves[*]}"
IFS="$OLDIFS"
verbose "Testing $test_curves with command $sslcommand"
ratelimit
local tmp=$(echo Q | $sslcommand -curves $test_curves 2>/dev/null)
parse_openssl_output <<<"$tmp"
if [[ -z $current_protocol || $current_cipher == "(NONE)" || $current_cipher == '0000' ]]; then
break
else
# server accepted connection
local ephem_data=(${current_pfs//,/ })
local cname=""
if [[ ${ephem_data[0]} =~ ECDH ]]; then
if [ "$current_curves" != "" ]; then
current_curves+=","
fi
cname="$(get_curve_name ${ephem_data[1]})"
verbose "Server selected ${ephem_data[1]}, a.k.a $cname"
current_curves+="$cname"
fi
for id in "${!curves[@]}"; do
if [ "$cname" == ${curves[$id]} ]; then
# we know it's supported, remove it from set of offered ones
unset curves[$id]
break
fi
done
fi
[ "$OUTPUTFORMAT" == "terminal" ] && [ $DEBUG -lt 1 ] && echo -n '.'
done
# don't penalize servers that will negotiate all curves we know of...
if [[ ${#curves[@]} -eq 0 ]]; then
fallback_supported="unknown"
fi
#
# check if curves ordering is server of client side
#
local tmp_curves=(${current_curves//,/ })
verbose "Server supported curves: ${tmp_curves[@]}"
# server supports just one or none, so it effectively uses server side
# ordering (as it dictates what curves client must support)
if [ ${#tmp_curves[@]} -lt 2 ]; then
curves_ordering="server"
else
# server supports at least 2 curves, rotate their order, see if
# selected changes
test_curves=""
most_wanted="${tmp_curves[${#tmp_curves[@]}-1]}"
for (( i=${#tmp_curves[@]}-1; i>0; i--)); do
test_curves+="${tmp_curves[$i]}:"
done
test_curves+="${tmp_curves[0]}"
verbose "Testing ordering with $sslcommand -curves $test_curves"
ratelimit
local tmp=$(echo Q | $sslcommand -curves $test_curves 2>/dev/null)
parse_openssl_output <<<"$tmp"
if [[ -z $current_protocol || $current_cipher == "(NONE)" || $current_cipher == '0000' ]]; then
fallback_supported="order-specific"
verbose "Server aborted connection"
else
local ephem_data=(${current_pfs//,/ })
verbose "Server selected $current_cipher with $current_pfs"
verbose "ephem_data: ${ephem_data[@]}"
if [[ ${ephem_data[0]} =~ ECDH ]]; then
verbose "Server did select ${ephem_data[1]} curve"
curves_ordering="inconclusive-${ephem_data[1]}"
local cname="$(get_curve_name ${ephem_data[1]})"
if [ "$cname" == "$most_wanted" ]; then
curves_ordering="client"
else
curves_ordering="server"
fi
else
# some servers downgrade to non ECDH when curve order is changed
curves_ordering="inconclusive-noecc"
fi
fi
fi
}
test_curves_fallback() {
# "True" if server supports ciphers that don't use ECC at a lower priority
local fallback_available="False"
# return variable: whatever a server will fall back to non ECC suite when
# client doesn't advertise support for curves the server needs
fallback_supported="unknown"
if [ "$ecc_ciphers" == "" ]; then
verbose "No ECC cipher found, can't test curve fallback"
return
fi
# prepare the ssl command we'll be using
local sslcommand=""
sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" -status $SCLIENTARGS -connect $TARGET -cipher $ecc_ciphers"
# force the TLS to send a TLS1.0 client hello at least, as with SSLv2
# ciphers present it will try to send a SSLv2 compatible client hello
sslcommand+=" -no_ssl2 -no_ssl3"
#
# here we use the same logic as with detecting cipher suites: first
# advertise all curves as supported, then remove curves one by one until we
# either get a fallback to a non ECC cipher, we run of curves or server
# tries to negotiate a curve we didn't advertise
#
local curves=(${CURVES[*]})
while [[ ${#curves[@]} -gt 0 ]]; do
OLDIFS="$IFS"
IFS=':'
local test_curves="${curves[*]}"
IFS="$OLDIFS"
verbose "Testing $sslcommand -curves $test_curves"
ratelimit
local tmp=$(echo Q | $sslcommand -curves $test_curves 2>/dev/null)
parse_openssl_output <<<"$tmp"
if [[ -z $current_protocol || $current_cipher == "(NONE)" || $current_cipher == '0000' ]]; then
verbose "Curve fallback failed, server refused connection"
fallback_supported="False"
break
else
# server accepted connection
local ephem_data=(${current_pfs//,/ })
if [[ ${ephem_data[0]} =~ ECDH ]]; then
# we got an ecc connection, remove the curve from the list of testable curves
local cname="$(get_curve_name ${ephem_data[1]})"
verbose "Server selected curve $cname"
for id in "${!curves[@]}"; do
if [ "${curves[id]}" == "$cname" ]; then
unset curves[$id]
break
fi
done
else
verbose "Server fell back to $current_cipher"
# ok, we got a fallback
fallback_supported="True"
break
fi
fi
done
}
# If no options are given, give usage information and exit (with error code)
if [ $# -eq 0 ]; then
usage;
exit 1
fi
# 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
;;
-D | --debug)
DEBUG=1
shift
;;
-d | --delay)
DELAY=$2
shift 2
;;
--capath)
CAPATH="$2"
shift 2
;;
--saveca)
SAVECA="True"
shift 1
;;
--savecrt)
SAVECRT="$2"
shift 2
;;
--curves)
TEST_CURVES="True"
shift 1
;;
--no-curves)
TEST_CURVES="False"
shift 1
;;
--) # End of all options
shift
break
;;
# -*)
# UNKNOWNOPTIONS=$((UNKNOWNOPTIONS+$1))
# # echo "WARN: Unknown option (ignored): $1" >&2
# shift
# ;;
*) # no more options we understand.
break
;;
esac
done
# echo parameters left: $@
TEMPTARGET=$(sed -e 's/^.* //'<<<"${@}")
HOST=$(sed -e 's/:.*//'<<<"${TEMPTARGET}")
PORT=$(sed -e 's/.*://'<<<"${TEMPTARGET}")
# Default to https if no port given
if [ "$HOST" = "$PORT" ]; then
PORT=443
fi
debug "host: $HOST"
debug "Port: $PORT"
TARGET=$HOST:$PORT
debug "target: $TARGET"
# test our openssl is usable
if [ ! -x $OPENSSLBIN ]; then
OPENSSLBIN=$(which openssl)
if [ "$OUTPUTFORMAT" == "terminal" ]; then
echo "custom openssl not executable, falling back to system one from $OPENSSLBIN"
fi
fi
if [ $TEST_CURVES == "True" ]; then
if [ ! -z "$($OPENSSLBIN s_client -curves 2>&1|head -1|grep 'unknown option')" ]; then
echo "curves testing not available with your version of openssl, disabling it"
TEST_CURVES="False"
fi
fi
if [ $VERBOSE != 0 ] ; then
[ -n "$CACERTS" ] && echo "Using trust anchors from $CACERTS"
echo "Loading $($OPENSSLBIN ciphers -v $CIPHERSUITE 2>/dev/null|grep Kx|wc -l) ciphersuites from $(echo -n $($OPENSSLBIN version 2>/dev/null))"
$OPENSSLBIN ciphers ALL 2>/dev/null
fi
SCLIENTARGS=$(sed -e s,${TEMPTARGET},,<<<"${@}")
debug "sclientargs: $SCLIENTARGS"
cipherspref=();
ciphercertificates=()
results=()
# Call to the recursive loop that retrieves the cipher preferences
get_cipher_pref $CIPHERSUITE
test_serverside_ordering
if [[ $TEST_CURVES == "True" ]]; then
test_curves_fallback
fi
if [ "$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 $1}'|sort|uniq); do
r="fail"
osslcommand="$TIMEOUTBIN $TIMEOUT $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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