cipherscan/cipherscan

#!/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

# 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 [[ "$READLINKBIN" == "" ]]; then
                READLINKBIN="$(which greadlink)"
                if [[ "$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 [[ "$TIMEOUTBIN" == "" ]]; then
                TIMEOUTBIN="$(which gtimeout)"
                if [[ "$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")

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}/${opensslbin_name}"
fi
OPENSSLBINHELP="$($OPENSSLBIN s_client -help 2>&1)"
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

# use custom config file to enable GOST ciphers
if [[ -e $DIRNAMEPATH/openssl.cnf ]]; then
    export OPENSSL_CONF="$DIRNAMEPATH/openssl.cnf"
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"
# 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'
)
# 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'
)
DEBUG=0
VERBOSE=0
DELAY=0
ALLCIPHERS=0
OUTPUTFORMAT="terminal"
TIMEOUT=30
USECOLORS="True"
# 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"
# 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
# array with results of tolerance scans (TLS version, extensions, etc.)
declare -A tls_tolerance

# 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)
--[no-]tolerance    test TLS tolerance
--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 $identifier"
            local map=(${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
            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_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)
                unset match[0]
                unset match[1]
                local old_IFS="$IFS"
                IFS="_"
                current_sigalg="${match[*]}"
                IFS="$old_IFS"
            fi
        done <<<"$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
    # Configure colors, if terminal supports them
    if [[ $USECOLORS == "True" && -x /usr/bin/tput ]] && tput setaf 1 >&/dev/null; then
        c_blue="\033[0;34m"
        c_green="\033[0;32m"
        c_red="\033[0;31m"
        c_reset="\033[0m"
    else
        c_reset=
        c_blue=
        c_green=
        c_red=
    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 [[ $TEST_CURVES == "True" && "${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 [[ ($sigalg =~ RSA && $pubkey -gt 2047) || ($sigalg =~ DSA && $pubkey -gt 255) ]]; then
        pubkey="${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 [[ $curvesordering == "" ]]; then
                curvesordering="${c_red}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_TOLERANCE == "True" ]]; then
        if [[ $tls_tolerance['big-TLSv1.2'] =~ TLSv1.2 ]]; then
            echo -e "TLS Tolerance: ${c_green}yes${c_reset}"
        else
            echo "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)
        [[ $ctr -gt 0 ]] && echo -n ','
        echo -n "{\"cipher\":\"${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 -n ',"configs":{'
    ctr=0
    for test_name in "${!tls_tolerance[@]}"; do
        local result=(${tls_tolerance[$test_name]})
        [[ $ctr -gt 0 ]] && echo -n ","
        echo -n "\"$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 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() {
    # 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() {
    # 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
}

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
        #
        OLDIFS="$IFS"
        IFS=":"
        local ciphers="${SHORTCIPHERSUITE[*]}"
        IFS="$OLDIFS"

        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
        #
        OLDIFS="$IFS"
        IFS=":"
        local ciphers="${SHORTCIPHERSUITE[*]}"
        IFS="$OLDIFS"

        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
}

# 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
            ;;
        --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="$2"
            shift 2
            ;;
        --curves)
            TEST_CURVES="True"
            shift 1
            ;;
        --no-curves)
            TEST_CURVES="False"
            shift 1
            ;;
        --tolerance)
            TEST_TOLERANCE="True"
            shift 1
            ;;
        --no-tolerance)
            TEST_TOLERANCE="False"
            shift 1
            ;;
        --no-colors)
            USECOLORS="False"
            shift 1
            ;;
        --) # End of all options
            shift
            break
            ;;
        # -*)
        #     UNKNOWNOPTIONS=$((UNKNOWNOPTIONS+$1))
        #     # echo "WARN: Unknown option (ignored): $1" >&2
        #     shift
        #     ;;
        *)  # no more options we understand.
            break
            ;;
    esac
done

if [[ -n $CAPATH && -n $CACERTS ]]; then
    echo "Both directory and file with CA certificates specified" 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 =~ ^[-:] || $TARGET =~ :.*[^0-9] ]]; then
    echo "The final argument '$TARGET' is not a valid HOST[:PORT]." 1>&2
    exit 1
fi
if ! [[ $TARGET =~ : ]]; then
    TARGET="${TARGET}:443"
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"
    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 [[ -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[*]}"
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[@]} -eq 0 ]] || [[ ${pref[1]} == "SSLv2" ]]; then
    cipherspref=()
    ciphercertificates=()
    results=()
    OLDIFS="$IFS"
    IFS=":"
    CIPHERS="${FALLBACKCIPHERSUITE[*]}"
    IFS="$OLDIFS"
    get_cipher_pref "$CIPHERS"
fi

if [[ $TEST_TOLERANCE == "True" ]]; then
    test_tls_tolerance
fi

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