LittleNellie/cipherscan
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dbce87cb1a
cipherscan/cipherscan
Hubert Kario dbce87cb1a fix printing of test data for intolerant servers 
tls_tolerance is an array, so we need to use array syntax...

since if the server is tls version intolerant we will be printing
a lot of info, space it out from the certificate-related summary

ephemeral sigalgs are also printing a lot of information, so space
them from the TLS Tolerance test results
2015-09-21 16:18:37 +02:00

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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, 2015
# vim: autoindent tabstop=4 shiftwidth=4 expandtab softtabstop=4 filetype=sh
DOBENCHMARK=0
BENCHMARKITER=30
# 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." 1>&2
echo "Please upgrade your version of bash (ex: brew install bash)." 1>&2
exit 1
fi
if [[ -n $NOAUTODETECT ]]; then
if ! [[ -f $TIMEOUTBIN && -x $TIMEOUTBIN ]]; then
echo "NOAUTODETECT set, but TIMEOUTBIN is not an executable file" 1>&2
exit 1
fi
if ! [[ -f $OPENSSLBIN && -x $OPENSSLBIN ]]; then
echo "NOAUTODETECT set, but OPENSSLBIN is not an executable file" 1>&2
exit 1
fi
else
case "$(uname -s)" in
Darwin)
opensslbin_name="openssl-darwin64"
READLINKBIN=$(which greadlink 2>/dev/null)
if [[ -z $READLINKBIN ]]; then
echo "greadlink not found. (try: brew install coreutils)" 1>&2
exit 1
fi
TIMEOUTBIN=$(which gtimeout 2>/dev/null)
if [[ -z $TIMEOUTBIN ]]; then
echo "gtimeout not found. (try: brew install coreutils)" 1>&2
exit 1
fi
;;
*)
opensslbin_name="openssl"
# test that readlink or greadlink (darwin) are present
READLINKBIN="$(which readlink)"
if [[ -z $READLINKBIN ]]; then
READLINKBIN="$(which greadlink)"
if [[ -z $READLINKBIN ]]; then
echo "neither readlink nor greadlink are present. install coreutils with {apt-get,yum,brew} install coreutils" 1>&2
exit 1
fi
fi
# test that timeout or gtimeout (darwin) are present
TIMEOUTBIN="$(which timeout)"
if [[ -z $TIMEOUTBIN ]]; then
TIMEOUTBIN="$(which gtimeout)"
if [[ -z $TIMEOUTBIN ]]; then
echo "neither timeout nor gtimeout are present. install coreutils with {apt-get,yum,brew} install coreutils" 1>&2
exit 1
fi
fi
# Check for busybox, which has different arguments
TIMEOUTOUTPUT="$($TIMEOUTBIN --help 2>&1)"
if [[ "$TIMEOUTOUTPUT" =~ BusyBox ]]; then
TIMEOUTBIN="$TIMEOUTBIN -t"
fi
;;
esac
fi
DIRNAMEPATH=$(dirname "$0")
join_array_by_char() {
# Two or less parameters (join + 0 or 1 value), then no need to set IFS because no join occurs.
if (( $# >= 3 )); then
# Three or more parameters (join + 2 values), then we need to set IFS for the join.
local IFS=$1
fi
# Discard the join string (usually ':', could be others).
shift
# Store the joined string in the result.
joined_array="$*"
}
# 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"
# some servers are intolerant to large client hello, try a shorter list of
# ciphers with them
SHORTCIPHERSUITE=(
'ECDHE-ECDSA-AES128-GCM-SHA256'
'ECDHE-RSA-AES128-GCM-SHA256'
'ECDHE-RSA-AES256-GCM-SHA384'
'ECDHE-ECDSA-AES256-SHA'
'ECDHE-ECDSA-AES128-SHA'
'ECDHE-RSA-AES128-SHA'
'ECDHE-RSA-AES256-SHA'
'ECDHE-RSA-DES-CBC3-SHA'
'ECDHE-ECDSA-RC4-SHA'
'ECDHE-RSA-RC4-SHA'
'DHE-RSA-AES128-SHA'
'DHE-DSS-AES128-SHA'
'DHE-RSA-CAMELLIA128-SHA'
'DHE-RSA-AES256-SHA'
'DHE-DSS-AES256-SHA'
'DHE-RSA-CAMELLIA256-SHA'
'EDH-RSA-DES-CBC3-SHA'
'AES128-SHA'
'CAMELLIA128-SHA'
'AES256-SHA'
'CAMELLIA256-SHA'
'DES-CBC3-SHA'
'RC4-SHA'
'RC4-MD5'
)
join_array_by_char ':' "${SHORTCIPHERSUITE[@]}"
SHORTCIPHERSUITESTRING="$joined_array"
# as some servers are intolerant to large client hello's (or ones that have
# RC4 ciphers below position 64), use the following for cipher testing in case
# of problems
FALLBACKCIPHERSUITE=(
'ECDHE-RSA-AES128-GCM-SHA256'
'ECDHE-RSA-AES128-SHA256'
'ECDHE-RSA-AES128-SHA'
'ECDHE-RSA-DES-CBC3-SHA'
'ECDHE-RSA-RC4-SHA'
'DHE-RSA-AES128-SHA'
'DHE-DSS-AES128-SHA'
'DHE-RSA-CAMELLIA128-SHA'
'DHE-RSA-AES256-SHA'
'DHE-DSS-AES256-SHA'
'DHE-RSA-CAMELLIA256-SHA'
'EDH-RSA-DES-CBC3-SHA'
'AES128-SHA'
'CAMELLIA128-SHA'
'AES256-SHA'
'CAMELLIA256-SHA'
'DES-CBC3-SHA'
'RC4-SHA'
'RC4-MD5'
'SEED-SHA'
'IDEA-CBC-SHA'
'IDEA-CBC-MD5'
'RC2-CBC-MD5'
'DES-CBC3-MD5'
'EXP1024-DHE-DSS-DES-CBC-SHA'
'EDH-RSA-DES-CBC-SHA'
'EXP1024-DES-CBC-SHA'
'DES-CBC-MD5'
'EXP1024-RC4-SHA'
'EXP-EDH-RSA-DES-CBC-SHA'
'EXP-DES-CBC-SHA'
'EXP-RC2-CBC-MD5'
'EXP-RC4-MD5'
)
join_array_by_char ':' "${FALLBACKCIPHERSUITE[@]}"
FALLBACKCIPHERSUITESTRING="$joined_array"
DEBUG=0
VERBOSE=0
DELAY=0
ALLCIPHERS=""
OUTPUTFORMAT="terminal"
TIMEOUT=30
USECOLORS="auto"
# place where to put the found intermediate CA certificates and where
# trust anchors are stored
SAVECRT=""
TEST_CURVES="True"
has_curves="False"
TEST_TOLERANCE="True"
SNI="True"
# openssl formated list of curves that will cause server to select ECC suite
ecc_ciphers=""
TEST_KEX_SIGALG="False"
unset known_certs
declare -A known_certs
unset cert_checksums
declare -A cert_checksums
# array with results of tolerance scans (TLS version, extensions, etc.)
declare -A tls_tolerance
# array with info on type of fallback on unknown sigalgs (or required ones)
declare -A sigalgs_fallback
# array with preferred sigalgs for aRSA and aECDSA ciphers
declare -a sigalgs_preferred_rsa
declare -a sigalgs_preferred_ecdsa
# 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)
--sigalg test signature algorithms used in TLSv1.2 ephemeral ciphers
(req. OpenSSL 1.0.2)
--[no-]tolerance test TLS tolerance
--no-sni don't use Server Name Indication
--colors force use of colors (autodetect by default)
--no-colors don't use terminal colors
-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 $identifier"
echo "${c%% *}"
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
if pushd "$1" > /dev/null; then
ln -s "$2" "${h}.${num}"
else
echo "'pushd $1' failed unexpectedly, refusing to proceed" 1>&2
exit 1
fi
popd > /dev/null
break
fi
done
}
check_option_support() {
[[ $OPENSSLBINHELP =~ "$1" ]]
}
parse_openssl_output() {
# clear variables in case matching doesn't hit them
current_ocspstaple="False"
current_cipher=""
current_kex_sigalg=""
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 the signing algorithm used in TLSv1.2 ephemeral kex
if [[ $line =~ Peer\ signing\ digest ]]; then
local match=($line)
current_kex_sigalg="${match[3]}"
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 > 0 )); then
local ossl_out=$(${OPENSSLBIN} x509 -noout -text 2>/dev/null <<<"${current_raw_certificates[0]}")
local regex='Signature Algorithm[^ ]+ +(.+$)'
while read data; do
if [[ $data =~ $regex ]]; then
current_sigalg="${BASH_REMATCH[1]// /_}"
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 [[ -n $ecc_ciphers ]]; then
ecc_ciphers+=":"
fi
ecc_ciphers+="$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 (( $? != 0 )); then
break
fi
done
# Time interval in nanoseconds
local t="$(($(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 '$ciphersuite'"
# If the connection succeeded with the current cipher, benchmark and store
if test_cipher_on_target "$sslcommand"; then
cipherspref=("${cipherspref[@]}" "$result")
ciphercertificates=("${ciphercertificates[@]}" "$certificates")
pciph=($result)
get_cipher_pref "!$pciph:$ciphersuite"
return 0
fi
}
display_sigalgs_in_terminal() {
(echo "prio sigalg"
for sigalg in "$@"; do
if [[ $sigalg == "MD5" ]]; then
color="${c_red}"
elif [[ $sigalg == "SHA1" ]]; then
color="${c_yellow}"
else
color="${c_green}"
fi
echo -e "$cnt ${color}$sigalg${c_reset}"
cnt=$((cnt+1))
done )| column -t
}
display_results_in_terminal() {
# Display the results
ctr=1
local pubkey
local sigalg
local trusted
local tickethint
local ocspstaple
local curvesordering
local different=False
# Configure colors, if terminal supports them
if [[ $USECOLORS == "auto" ]]; then
if [[ -t 1 ]]; then
USECOLORS="True"
else
USECOLORS="False"
fi
fi
if [[ $USECOLORS == "True" ]]; then
c_blue="\033[0;34m"
c_green="\033[0;32m"
c_yellow="\033[0;33m"
c_red="\033[0;31m"
c_reset="\033[0m"
else
c_blue=
c_green=
c_yellow=
c_red=
c_reset=
fi
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" && -n ${cipher_data[9]} ]]; then
curvesordering="${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 [[ -z $curvesordering && -n "${cipher_data[9]}" ]]; then
curvesordering="${cipher_data[9]}"
fi
if [[ -n $curvesordering && "$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 [[ ($sigalg =~ RSA && $pubkey -ge 2047) || ($sigalg =~ ECDSA && $pubkey -gt 255) ]]; then
pubkey="${c_green}${pubkey}${c_reset}"
else
pubkey="${c_red}${pubkey}${c_reset}"
fi
if [[ $sigalg =~ md5|sha1 ]]; then
sigalg="${c_red}${sigalg}${c_reset}"
else
sigalg="${c_green}${sigalg}${c_reset}"
fi
if [[ $trusted == "True" ]]; then
trusted="${c_green}trusted${c_reset}"
else
trusted="${c_green}untrusted${c_reset}"
fi
if [[ $different != "True" ]]; then
echo -e "Certificate: $trusted, $pubkey bits, $sigalg signature"
echo "TLS ticket lifetime hint: $tickethint"
fi
if [[ $ocspstaple == "True" ]]; then
echo -e "OCSP stapling: ${c_green}supported${c_reset}"
else
echo -e "OCSP stapling: ${c_red}not supported${c_reset}"
fi
if [[ $serverside == "True" ]]; then
echo -e "Cipher ordering: ${c_green}server${c_reset}"
else
echo -e "Cipher ordering: ${c_red}client${c_reset}"
fi
if [[ $TEST_CURVES == "True" ]]; then
if [[ $curvesordering == "server" ]]; then
curvesordering="${c_green}${curvesordering}${c_reset}"
else
if [[ $curvesordering == "" ]]; then
curvesordering="none"
fi
curvesordering="${c_red}${curvesordering}${c_reset}"
fi
if [[ $fallback_supported == "True" ]]; then
fallback_supported="${c_green}yes${c_reset}"
else
fallback_supported="${c_red}no${c_reset}"
fi
echo -e "Curves ordering: $curvesordering - fallback: $fallback_supported"
fi
if [[ $TEST_KEX_SIGALG == "True" ]]; then
echo
echo "TLSv1.2 ephemeral sigalgs:"
for auth in "ECDSA" "RSA"; do
# not colored as neither of that results alone is good or bad
if [[ -z ${sigalgs_fallback[$auth]} ]]; then
echo "no PFS $auth ciphers detected"
elif [[ ${sigalgs_fallback[$auth]} == "False" ]]; then
echo "no PFS $auth fallback"
elif [[ ${sigalgs_fallback[$auth]} == "intolerant" ]]; then
echo "$auth test: intolerant of sigalg removal"
elif [[ ${sigalgs_fallback[$auth]} =~ "pfs-" ]]; then
echo "PFS $auth fallbacks to ${sigalgs_fallback[$auth]}"
else
echo "server forces ${sigalgs_fallback[$auth]} with $auth"
fi
done
if [[ ${sigalgs_ordering} == "server" ]]; then
echo -e "${c_green}Server side sigalg ordering${c_reset}"
elif [[ ${sigalgs_ordering} == "client" ]]; then
echo -e "${c_red}Client side sigalg ordering${c_reset}"
elif [[ ${sigalgs_ordering} == "unsupported" ]]; then
# do nothing - messages above will report that it's unsupported
echo -n
else
echo "Ordering test failure: ${sigalgs_ordering}"
fi
if [[ ${#sigalgs_preferred_ecdsa[@]} -gt 0 ]]; then
echo
if [[ ${sigalgs_preferred_ecdsa[0]} == "Fail" ]]; then
echo -e "${c_red}ECDSA test failed${c_reset}"
else
local cnt=1
echo "Supported PFS ECDSA signature algorithms"
display_sigalgs_in_terminal "${sigalgs_preferred_ecdsa[@]}"
fi
fi
if [[ ${#sigalgs_preferred_rsa[@]} -gt 0 ]]; then
echo
if [[ ${sigalgs_preferred_rsa[0]} == "Fail" ]]; then
echo -e "${c_red}RSA test failed${c_reset}"
else
local cnt=1
echo "Supported PFS RSA signature algorithms"
display_sigalgs_in_terminal "${sigalgs_preferred_rsa[@]}"
fi
fi
echo
fi
if [[ $TEST_TOLERANCE == "True" ]]; then
if [[ ${tls_tolerance['big-TLSv1.2']} =~ TLSv1\.2 ]]; then
echo -e "TLS Tolerance: ${c_green}yes${c_reset}"
else
echo
echo -e "TLS Tolerance: ${c_red}no${c_reset}"
echo "Fallbacks required:"
for test_name in "${!tls_tolerance[@]}"; do
if [[ ${tls_tolerance[$test_name]} == "False" ]]; then
echo "$test_name config not supported, connection failed"
else
local res=(${tls_tolerance[$test_name]})
echo "$test_name no fallback req, connected: ${res[1]} ${res[2]}"
fi
done | sort
fi
fi
}
display_results_in_json() {
# Display the results in json
ctr=0
echo -n "{\"target\":\"$TARGET\",\"utctimestamp\":\"$(date -u '+%FT%T.0Z')\",\"serverside\":\"${serverside}\",\"ciphersuite\": ["
for cipher in "${cipherspref[@]}"; do
local cipher_arr=($cipher)
(( ctr > 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]}"
[[ -z $pfs ]] && pfs="None"
echo -n "\"pfs\":\"$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
if [[ $TEST_KEX_SIGALG == "True" ]]; then
echo -n ',"sigalgs":{'
echo -n "\"ordering\":\"${sigalgs_ordering}\","
echo -n "\"ECDSA-fallback\":\"${sigalgs_fallback[ECDSA]}\","
echo -n "\"RSA-fallback\":\"${sigalgs_fallback[RSA]}\""
if [[ ${#sigalgs_preferred_ecdsa[@]} -gt 0 ]]; then
echo -n ","
echo -n '"ECDSA":['
local cnt=0
for sigalg in "${sigalgs_preferred_ecdsa[@]}"; do
if [[ $cnt -gt 0 ]]; then
echo -n ','
fi
echo -n "\"$sigalg\""
cnt=$((cnt+1))
done
echo -n ']'
fi
if [[ ${#sigalgs_preferred_rsa[@]} -gt 0 ]]; then
echo -n ","
echo -n '"RSA":['
local cnt=0
for sigalg in "${sigalgs_preferred_rsa[@]}"; do
if [[ $cnt -gt 0 ]]; then
echo -n ','
fi
echo -n "\"$sigalg\""
cnt=$((cnt+1))
done
echo -n ']'
fi
echo -n '}'
fi
echo -n ',"configs":{'
ctr=0
for test_name in "${!tls_tolerance[@]}"; do
local result=(${tls_tolerance[$test_name]})
(( ctr > 0 )) && echo -n ","
echo -n "\"$test_name\":{"
if [[ ${result[0]} == "False" ]]; then
echo -n "\"tolerant\":\"False\""
else
echo -n "\"tolerant\":\"True\",\"proto\":\"${result[1]}\","
echo -n "\"cipher\":\"${result[2]}\",\"trusted\":\"${result[3]}\""
fi
echo -n "}"
ctr=$((ctr+1))
done
echo '}}'
}
test_serverside_ordering() {
local -a ciphersuites=()
local ciphersuite=""
local prefered=""
# server supports only one cipher or no ciphers, so it effectively uses server side ordering...
if (( ${#cipherspref[@]} < 2 )); then
serverside="True"
return 0
fi
local cipher=""
if (( ${#cipherspref[@]} > 2 )); then
# server supports 3 or more ciphers, rotate all three. This is necessary because google does
# select first client provided cipher, if it is either CDHE-RSA-AES128-GCM-SHA256 or
# ECDHE-RSA-CHACHA20-POLY1305
ciphersuites+=("${cipherspref[2]%% *}")
fi
# else, server supports just two ciphers, so rotate them, that should be enough
ciphersuites+=("${cipherspref[1]%% *}")
ciphersuites+=("${cipherspref[0]%% *}")
prefered="${ciphersuites[0]%% *}"
join_array_by_char ':' "${ciphersuites[@]}"
ciphersuite="$joined_array"
local sslcommand="$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 (( $? != 0 )); then
serverside="True"
else
if [[ ${result%% *} == "$prefered" ]]; then
serverside="False"
else
serverside="True"
fi
fi
}
test_curves() {
# 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=(${CURVES[*]})
join_array_by_char ':' "${curves[@]}"
verbose "Will test following curves: $joined_array"
# prepare the ssl command we'll be using
local sslcommand=""
sslcommand="$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 (( ${#curves[@]} > 0 )); do
join_array_by_char ':' "${curves[@]}"
local test_curves="$joined_array"
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 [[ -n $current_curves ]]; then
current_curves+=","
fi
cname="$(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 (( ${#tmp_curves[@]} < 2 )); then
curves_ordering="server"
else
# server supports at least 2 curves, rotate their order, see if
# selected changes
test_curves=""
most_wanted="${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() {
# 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 [[ -z $ecc_ciphers ]]; then
verbose "No ECC cipher found, can't test curve fallback"
return
fi
# prepare the ssl command we'll be using
local sslcommand=""
sslcommand="$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 (( ${#curves[@]} > 0 )); do
join_array_by_char ':' "${curves[@]}"
local test_curves="$joined_array"
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 $current_cipher"
# ok, we got a fallback
fallback_supported="True"
break
fi
fi
done
}
test_tls_tolerance() {
#
# first test general version tolerance with all we've got (full list of
# curves, full list of ciphers, NPN, ALPN
#
declare -A tls_vers_tests
tls_vers_tests['big-TLSv1.2']=""
tls_vers_tests['big-TLSv1.1']="-no_tls1_2"
tls_vers_tests['big-TLSv1.0']="-no_tls1_2 -no_tls1_1"
tls_vers_tests['big-SSLv3']="-no_tls1_2 -no_tls1_1 -no_tls1"
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
sslcommand+=" -status -nextprotoneg 'http/1.1'"
sslcommand+=" $SCLIENTARGS -connect $TARGET -cipher $CIPHERSUITE"
for version in "${!tls_vers_tests[@]}"; do
ratelimit
verbose "Testing fallback with $sslcommand ${tls_vers_tests[$version]}"
local tmp=$(echo Q | $sslcommand ${tls_vers_tests[$version]} 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance[$version]="False"
else
tls_tolerance[$version]="True $current_protocol $current_cipher $current_trusted"
fi
done
# if TLS1.2 didn't succeeded, try different fallbacks
if [[ ${tls_tolerance['big-TLSv1.2']} == "False" ]]; then
#
# Try big client hello, but with a version 2 compatible format
# (openssl automatically does that when there are SSLv2 ciphers in
# cipher string and no options are specified)
#
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [[ -n "$CAPATH" ]]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [[ -e "$CACERTS" ]]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" -connect $TARGET -cipher $CIPHERSUITE"
ratelimit
verbose "Testing fallback with $sslcommand"
local tmp=$(echo Q | $sslcommand 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['v2-big-TLSv1.2']="False"
else
tls_tolerance['v2-big-TLSv1.2']="True $current_protocol $current_cipher $current_trusted"
fi
#
# try a smaller, but still v2 compatible Client Hello
#
local ciphers="$SHORTCIPHERSUITESTRING"
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [[ -n "$CAPATH" ]]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [[ -e "$CACERTS" ]]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" -connect $TARGET -cipher $ciphers"
ratelimit
verbose "Testing fallback with $sslcommand"
local tmp=$(echo Q | $sslcommand 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['v2-small-TLSv1.2']="False"
else
tls_tolerance['v2-small-TLSv1.2']="True $current_protocol $current_cipher $current_trusted"
fi
#
# v2, small but with TLS1.1 as max version
#
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2"
local tmp=$(echo Q | $sslcommand -no_tls1_2 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['v2-small-TLSv1.1']="False"
else
tls_tolerance['v2-small-TLSv1.1']="True $current_protocol $current_cipher $current_trusted"
fi
#
# v2, small but with TLS1.0 as max version
#
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2 -no_tls1_1"
local tmp=$(echo Q | $sslcommand -no_tls1_2 -no_tls1_1 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['v2-small-TLSv1.0']="False"
else
tls_tolerance['v2-small-TLSv1.0']="True $current_protocol $current_cipher $current_trusted"
fi
#
# v2, small but with SSLv3 as max version
#
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2 -no_tls1_1 -no_tls1"
local tmp=$(echo Q | $sslcommand -no_tls1_2 -no_tls1_1 -no_tls1 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['v2-small-SSLv3']="False"
else
tls_tolerance['v2-small-SSLv3']="True $current_protocol $current_cipher $current_trusted"
fi
#
# use v3 format TLSv1.2 hello, small cipher list
#
local ciphers="$SHORTCIPHERSUITESTRING"
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [[ -n "$CAPATH" ]]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [[ -e "$CACERTS" ]]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" $SCLIENTARGS -connect $TARGET -cipher $ciphers:!SSLv2"
ratelimit
verbose "Testing fallback with $sslcommand"
local tmp=$(echo Q | $sslcommand 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['small-TLSv1.2']="False"
else
tls_tolerance['small-TLSv1.2']="True $current_protocol $current_cipher $current_trusted"
fi
#
# v3 format TLSv1.1 hello, small cipher list
#
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2"
local tmp=$(echo Q | $sslcommand -no_tls1_2 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['small-TLSv1.1']="False"
else
tls_tolerance['small-TLSv1.1']="True $current_protocol $current_cipher $current_trusted"
fi
#
# v3 format TLSv1.0 hello, small cipher list
#
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2 -no_tls1_1"
local tmp=$(echo Q | $sslcommand -no_tls1_2 -no_tls1_1 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['small-TLSv1.0']="False"
else
tls_tolerance['small-TLSv1.0']="True $current_protocol $current_cipher $current_trusted"
fi
#
# v3 format TLSv1.0 hello, small cipher list, no extensions
#
if check_option_support "-no_tlsext"; then
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2 -no_tls1_1 -no_tlsext"
local tmp=$(echo Q | $sslcommand -no_tls1_2 -no_tls1_1 -no_tlsext 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['small-TLSv1.0-notlsext']="False"
else
tls_tolerance['small-TLSv1.0-notlsext']="True $current_protocol $current_cipher $current_trusted"
fi
fi
#
# v3 format SSLv3 hello, small cipher list
#
ratelimit
verbose "Testing fallback with $sslcommand -no_tls1_2 -no_tls1_1 -no_tls1"
local tmp=$(echo Q | $sslcommand -no_tls1_2 -no_tls1_1 -no_tls1 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "Negotiated proto: $current_protocol, cipher: $current_cipher"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == '0000' ]]; then
tls_tolerance['small-SSLv3']="False"
else
tls_tolerance['small-SSLv3']="True $current_protocol $current_cipher $current_trusted"
fi
fi
}
test_kex_sigalgs() {
local ecdsa_sigalgs=("ECDSA+SHA512" "ECDSA+SHA384" "ECDSA+SHA256"
"ECDSA+SHA224" "ECDSA+SHA1" "ECDSA+MD5")
local rsa_sigalgs=("RSA+SHA512" "RSA+SHA384" "RSA+SHA256"
"RSA+SHA224" "RSA+SHA1" "RSA+MD5")
local supported_rsa_ciphers=""
local supported_ecdsa_ciphers=""
local supported_ciphers=()
# check if TLS1.2 is supported by server, as tests needs it
# collect ciphers
local tls12="False"
for cipher in "${cipherspref[@]}"; do
local ciph_data=($cipher)
if [[ ${ciph_data[1]} =~ TLSv1.2 ]]; then
tls12="True"
fi
supported_ciphers+=(${ciph_data[0]})
done
if [[ $tls12 == "False" ]]; then
return
fi
# create cipher list for ecdsa and rsa tests that include non ephemeral
# ciphers for fallback
for cipher in "${supported_ciphers[@]}"; do
if [[ $cipher =~ DHE-ECDSA ]]; then
if [[ $supported_ecdsa_ciphers ]]; then
supported_ecdsa_ciphers+=":"
fi
supported_ecdsa_ciphers+="$cipher"
elif [[ ${supported_ecdsa_ciphers} ]]; then
supported_ecdsa_ciphers+=":$cipher"
fi
if [[ $cipher =~ DHE-RSA ]]; then
if [[ $supported_rsa_ciphers ]]; then
supported_rsa_ciphers+=":"
fi
supported_rsa_ciphers+="$cipher"
elif [[ ${supported_rsa_ciphers} ]]; then
supported_rsa_ciphers+=":$cipher"
fi
done
#
# Test default sigalgs for aECDSA ciphers
#
if [[ $supported_ecdsa_ciphers ]]; then
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" $SCLIENTARGS -connect $TARGET -cipher $supported_ecdsa_ciphers"
# since some ciphers supported by server may be SSLv2 only, we need to
# force use of TLSv1.2, otherwise openssl will send a SSLv2 compatible
# client hello
sslcommand+=" -no_ssl2 -no_ssl3"
local test_ecdsa_sigalgs=("${ecdsa_sigalgs[@]}")
local test_rsa_sigalgs=("${rsa_sigalgs[@]}")
while true; do
join_array_by_char ":" "${test_ecdsa_sigalgs[@]}" \
"${test_rsa_sigalgs[@]}"
local test_sigalgs="$joined_array"
ratelimit
verbose "Testing default ECDSA sig algs with $sslcommand -sigalgs $test_sigalgs"
local tmp=$(echo Q | $sslcommand -sigalgs $test_sigalgs 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "server selected $current_cipher, $current_protocol, $current_kex_sigalg"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == "0000" ]]; then
if [[ ${#test_ecdsa_sigalgs[@]} -eq 0 ]]; then
sigalgs_fallback["ECDSA"]="False"
else
sigalgs_fallback["ECDSA"]="intolerant"
fi
break
fi
if [[ $current_cipher =~ DHE-ECDSA ]]; then
if [[ -z $current_kex_sigalg ]]; then
# if we didn't get a sigalg that means the test failed
sigalgs_preferred_ecdsa=("Fail")
break
fi
if [[ "${test_ecdsa_sigalgs[*]}" =~ "ECDSA+$current_kex_sigalg" ]]; then
# save sigalg for reporting
sigalgs_preferred_ecdsa+=("$current_kex_sigalg")
# remove it from offered
local id
for id in "${!test_ecdsa_sigalgs[@]}"; do
if [[ ${test_ecdsa_sigalgs[$id]} =~ $current_kex_sigalg ]]; then
unset test_ecdsa_sigalgs[$id]
break
fi
done
# continue testing
else
# server selected sigalg we didn't offer
sigalgs_fallback["ECDSA"]="$current_kex_sigalg"
break
fi
elif [[ $current_cipher =~ DHE-RSA ]]; then
# we got a fallback to a RSA based cipher
if [[ -z $current_kex_sigalg ]]; then
sigalgs_fallback["ECDSA"]="pfs-rsa"
else
sigalgs_fallback["ECDSA"]="pfs-rsa-${current_kex_sigalg}"
fi
break
else
# we got a fallback to a non PFS cipher, that's good too
sigalgs_fallback["ECDSA"]="soft-nopfs"
break
fi
[ "$OUTPUTFORMAT" == "terminal" ] && [ $DEBUG -lt 1 ] && echo -n '.'
done
fi
#
# Test default sigalgs for aRSA ciphers
#
if [[ ${supported_rsa_ciphers} ]]; then
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" $SCLIENTARGS -connect $TARGET -cipher $supported_rsa_ciphers"
# since some ciphers supported by server may be SSLv2 only, we need to
# force use of TLSv1.2, otherwise openssl will send a SSLv2 compatible
# client hello
sslcommand+=" -no_ssl2 -no_ssl3"
local test_ecdsa_sigalgs=("${ecdsa_sigalgs[@]}")
local test_rsa_sigalgs=("${rsa_sigalgs[@]}")
while true; do
join_array_by_char ":" "${test_rsa_sigalgs[@]}" \
"${test_ecdsa_sigalgs[@]}"
local test_sigalgs="$joined_array"
ratelimit
verbose "Testing default RSA sig algs with $sslcommand -sigalgs $test_sigalgs"
local tmp=$(echo Q | $sslcommand -sigalgs $test_sigalgs 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "server selected $current_cipher, $current_protocol, $current_kex_sigalg"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == "0000" ]]; then
if [[ ${#test_rsa_sigalgs[@]} -eq 0 ]]; then
sigalgs_fallback["RSA"]="False"
else
sigalgs_fallback["RSA"]="intolerant"
fi
break
fi
if [[ $current_cipher =~ DHE-RSA ]]; then
if [[ -z $current_kex_sigalg ]]; then
# if we didn't get a sigalg that means the test failed
sigalgs_preferred_rsa=("Fail")
break
fi
if [[ "${test_rsa_sigalgs[*]}" =~ "RSA+$current_kex_sigalg" ]]; then
# save sigalg for reporting
sigalgs_preferred_rsa+=("$current_kex_sigalg")
# remove it from offered
local id
for id in "${!test_rsa_sigalgs[@]}"; do
if [[ ${test_rsa_sigalgs[$id]} =~ $current_kex_sigalg ]]; then
unset test_rsa_sigalgs[$id]
break
fi
done
# continue testing
else
# server selected sigalg we didn't offer
sigalgs_fallback["RSA"]="$current_kex_sigalg"
break
fi
elif [[ $current_cipher =~ DHE-ECDSA ]]; then
# we got a fallback to an ECDSA based cipher
if [[ -z $current_kex_sigalg ]]; then
sigalgs_fallback["RSA"]="pfs-ecdsa"
else
sigalgs_fallback["RSA"]="pfs-ecdsa-${current_kex_sigalg}"
fi
break
else
# we got a fallback to a non PFS cipher, that's good too
sigalgs_fallback["RSA"]="soft-nopfs"
break
fi
[ "$OUTPUTFORMAT" == "terminal" ] && [ $DEBUG -lt 1 ] && echo -n '.'
done
fi
#
# test which ordering is preferred, server or client
#
if [[ ${#sigalgs_preferred_rsa[@]} -eq 0 \
&& ${#sigalgs_preferred_ecdsa[@]} -eq 0 ]]; then
sigalgs_ordering="unsupported"
elif [[ ${#sigalgs_preferred_rsa[@]} -le 1 \
&& ${#sigalgs_preferred_ecdsa[@]} -le 1 ]]; then
# if there is just one hash for each signature algorithm, that means
# the server essentially forces the signature algorithm on client
sigalgs_ordering="server"
elif [[ ${#sigalgs_preferred_ecdsa[@]} -gt 1 ]]; then
# in case server supports multiple ECDSA sigalgs, test just those,
# even if it supports RSA (since those are more important)
# completely rotate order check if negotiated changes
local test_sigalgs=""
local i
for ((i=${#sigalgs_preferred_ecdsa[@]}-1; i>0; i--)); do
test_sigalgs+="ECDSA+${sigalgs_preferred_ecdsa[$i]}:"
done
test_sigalgs+="ECDSA+${sigalgs_preferred_ecdsa[0]}"
# prepare the command to run
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" $SCLIENTARGS -connect $TARGET -cipher $supported_ecdsa_ciphers"
# since some ciphers supported by server may be SSLv2 only, we need to
# force use of TLSv1.2, otherwise openssl will send a SSLv2 compatible
# client hello
sslcommand+=" -no_ssl2 -no_ssl3"
ratelimit
verbose "Test ordering of sigalgs with $sslcommand -sigalgs $test_sigalgs"
local tmp=$(echo Q | $sslcommand -sigalgs $test_sigalgs 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "server selected $current_cipher, $current_protocol, $current_kex_sigalg"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == "0000" ]]; then
sigalgs_ordering="intolerant"
elif [[ -z $current_kex_sigalg ]] || [[ ! $current_cipher =~ DHE-ECDSA ]]; then
sigalgs_ordering="order-fallback"
else
if [[ ${sigalgs_preferred_ecdsa[0]} == $current_kex_sigalg ]]; then
sigalgs_ordering="server"
elif [[ ${sigalgs_preferred_ecdsa[${#sigalgs_preferred_ecdsa[@]}-1]} \
== $current_kex_sigalg ]]; then
sigalgs_ordering="client"
else
sigalgs_ordering="indeterminate"
fi
fi
else
# test ordering with RSA ciphers
# completely rotate order check if negotiated changes
local test_sigalgs=""
local i
for ((i=${#sigalgs_preferred_rsa[@]}-1; i>0; i--)); do
test_sigalgs+="RSA+${sigalgs_preferred_rsa[$i]}:"
done
test_sigalgs+="RSA+${sigalgs_preferred_rsa[0]}"
# prepare the command to run
local sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
if [ -n "$CAPATH" ]; then
sslcommand+=" -CApath $CAPATH -showcerts"
elif [ -e "$CACERTS" ]; then
sslcommand+=" -CAfile $CACERTS"
fi
sslcommand+=" $SCLIENTARGS -connect $TARGET -cipher $supported_rsa_ciphers"
# since some ciphers supported by server may be SSLv2 only, we need to
# force use of TLSv1.2, otherwise openssl will send a SSLv2 compatible
# client hello
sslcommand+=" -no_ssl2 -no_ssl3"
ratelimit
verbose "Test ordering of sigalgs with $sslcommand -sigalgs $test_sigalgs"
local tmp=$(echo Q | $sslcommand -sigalgs $test_sigalgs 2>/dev/null)
parse_openssl_output <<<"$tmp"
verbose "server selected $current_cipher, $current_protocol, $current_kex_sigalg"
if [[ -z $current_protocol || $current_cipher == "(NONE)" \
|| $current_cipher == "0000" ]]; then
sigalgs_ordering="intolerant"
elif [[ -z $current_kex_sigalg ]] || [[ ! $current_cipher =~ DHE-RSA ]]; then
sigalgs_ordering="order-fallback"
else
if [[ ${sigalgs_preferred_rsa[0]} == $current_kex_sigalg ]]; then
sigalgs_ordering="server"
elif [[ ${sigalgs_preferred_rsa[${#sigalgs_preferred_rsa[@]}-1]} \
== $current_kex_sigalg ]]; then
sigalgs_ordering="client"
else
sigalgs_ordering="indeterminate"
fi
fi
fi
}
# If no options are given, give usage information and exit (with error code)
if (( $# == 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
;;
--cafile)
CACERTS="$2"
shift 2
# We need to bypass autodetection if this is provided.
CACERTS_ARG_SET=1
;;
--capath)
CAPATH="$2"
shift 2
;;
--saveca)
SAVECA="True"
shift 1
;;
--savecrt)
SAVECRT="$2"
shift 2
;;
--curves)
TEST_CURVES="True"
shift 1
;;
--no-curves)
TEST_CURVES="False"
shift 1
;;
--sigalg)
TEST_KEX_SIGALG="True"
shift 1
;;
--tolerance)
TEST_TOLERANCE="True"
shift 1
;;
--no-tolerance)
TEST_TOLERANCE="False"
shift 1
;;
--colors)
USECOLORS="True"
shift 1
;;
--no-colors)
USECOLORS="False"
shift 1
;;
--no-sni)
SNI="False"
shift 1
;;
--) # End of all options
shift
break
;;
# -*)
# UNKNOWNOPTIONS=$((UNKNOWNOPTIONS+$1))
# # echo "WARN: Unknown option (ignored): $1" >&2
# shift
# ;;
*) # no more options we understand.
break
;;
esac
done
if [[ -z $OPENSSLBIN ]]; then
readlink_result=$("$READLINKBIN" -f "$0")
if [[ -z $readlink_result ]]; then
echo "$READLINKBIN -f $0 failed, aborting." 1>&2
exit 1
fi
REALPATH=$(dirname "$readlink_result")
if [[ -z $REALPATH ]]; then
echo "dirname $REALPATH failed, aborting." 1>&2
exit 1
fi
OPENSSLBIN="${REALPATH}/${opensslbin_name}"
fi
# use custom config file to enable GOST ciphers
if [[ -e $DIRNAMEPATH/openssl.cnf ]]; then
export OPENSSL_CONF="$DIRNAMEPATH/openssl.cnf"
fi
OPENSSLBINHELP="$($OPENSSLBIN s_client -help 2>&1)"
if [[ $OPENSSLBINHELP =~ :error: ]]; then
verbose "$OPENSSLBIN can't handle GOST config, disabling"
unset OPENSSL_CONF
OPENSSLBINHELP="$($OPENSSLBIN s_client -help 2>&1)"
fi
if ! [[ $OPENSSLBINHELP =~ -connect ]]; then
echo "$OPENSSLBIN s_client doesn't accept the -connect parameter, which is extremely strange; refusing to proceed." 1>&2
exit 1
fi
if [[ -n $CAPATH && -n $CACERTS ]]; then
echo "Both directory and file with CA certificates specified" 1>&2
exit 1
fi
if [[ -n $ALLCIPHERS && $OUTPUTFORMAT == "json" ]]; then
echo "--allciphers cannot produce JSON output, aborting." 1>&2
exit 1
fi
# echo parameters left: $@
if (( $# < 1 )); then
echo "The final argument must be a valid HOST[:PORT], but none was provided." 1>&2
exit 1
fi
PARAMS=("$@")
TARGET=${PARAMS[-1]}
unset PARAMS[-1]
# Refuse to proceed if the hostname starts with a hyphen, since hostnames can't
# begin with a hyphen and this likely means we accidentally parsed an option as
# a hostname.
if [[ -z $TARGET || $TARGET =~ ^[-:] ]]; then
echo "The final argument '$TARGET' is not a valid HOST[:PORT]." 1>&2
exit 1
fi
# Handle Targets that are URIs
if [[ $TARGET =~ /([^/]+)(/|$) ]]; then
TARGET="${BASH_REMATCH[1]}"
fi
if [[ $TARGET =~ :.*[^0-9] ]]; then
echo "Final argument is not a valid HOST[:PORT]" >&2
exit 1
fi
if ! [[ $TARGET =~ : ]]; then
sni_target=$TARGET
TARGET="${TARGET}:443"
else
# strip the port for the sni_target
if [[ "$TARGET" =~ (.*):([0-9]{1,5}) ]]; then
sni_target="${BASH_REMATCH[1]}"
fi
fi
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" 1>&2
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" 1>&2
TEST_CURVES="False"
fi
fi
if [[ -z $CACERTS ]] && ! [[ -n $CACERTS_ARG_SET ]]; then
# find a list of trusted CAs on the local system, or use the provided list
for f in /etc/pki/tls/certs/ca-bundle.crt /etc/ssl/certs/ca-certificates.crt; do
if [[ -e "$f" ]]; then
CACERTS="$f"
break
fi
done
if [[ ! -e "$CACERTS" ]]; then
CACERTS="$DIRNAMEPATH/ca-bundle.crt"
fi
fi
if ! [[ -e $CACERTS && -r $CACERTS ]]; then
echo "--cafile $CACERTS is not a readable file, aborting." 1>&2
exit 1
fi
if [[ -n $CAPATH ]] && ! [[ -d $CAPATH ]]; then
echo "--capath $CAPATH is not a directory, aborting." 1>&2
exit 1
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))"
$OPENSSLBIN ciphers ALL 2>/dev/null
fi
SCLIENTARGS="${PARAMS[*]}"
# only append the SNI:
# if the target is a hostname by validating the tld
# if -servername was not supplied by the user
if [[ $SNI == "True" && ! $SCLIENTARGS =~ servername ]]; then
if [[ $sni_target =~ \.[a-zA-Z]{1,20}$ ]]; then
SCLIENTARGS="$SCLIENTARGS -servername $sni_target"
else
echo "Warning: target is not a FQDN. SNI was disabled. Use a FQDN or '-servername <fqdn>'" 1>&2
fi
fi
debug "sclientargs: $SCLIENTARGS"
cipherspref=()
ciphercertificates=()
results=()
# Call to the recursive loop that retrieves the cipher preferences
get_cipher_pref $CIPHERSUITE
# in case the server is intolerant to our big hello, try again with
# a smaller one
# do that either when the normal scan returns no ciphers or just SSLv2
# ciphers (where it's likely that the limiting by OpenSSL worked)
pref=(${cipherspref[0]})
if (( ${#cipherspref[@]} == 0 )) || [[ ${pref[1]} == "SSLv2" ]]; then
cipherspref=()
ciphercertificates=()
results=()
get_cipher_pref "$FALLBACKCIPHERSUITESTRING"
fi
if [[ $TEST_TOLERANCE == "True" ]]; then
test_tls_tolerance
fi
test_serverside_ordering
if [[ $TEST_KEX_SIGALG == "True" ]]; then
test_kex_sigalgs
fi
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 [[ -n $ALLCIPHERS ]]; then
echo; echo "All accepted ciphersuites"
for c in $($OPENSSLBIN ciphers -v ALL:COMPLEMENTOFALL 2>/dev/null |awk '{print $1}'|sort -u); do
osslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client $SCLIENTARGS -connect $TARGET -cipher $c"
if test_cipher_on_target "$osslcommand"; then
r="pass"
else
r="fail"
fi
printf "%-35s %s\n" "$c" "$r"
done
fi
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