mirror of
https://github.com/mozilla/cipherscan.git
synced 2024-11-04 15:03:41 +01:00
add support for testing supported curves
since early versions of 1.0.2 openssl supports -curves command line option, it allows us to set the curves advertised as supported use the same approach to testing: advertise all, check what server accepts, remove the accepted from list, repeat. When server aborts connection or selects non ECC cipher, we know that we've tested all.
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parent
800eff19ce
commit
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280
cipherscan
280
cipherscan
@ -61,6 +61,7 @@ TIMEOUT=30
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# trust anchors are stored
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CAPATH=""
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SAVECRT=""
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TEST_CURVES="False"
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unset known_certs
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declare -A known_certs
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unset cert_checksums
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@ -99,6 +100,7 @@ Use one of the options below:
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-j | --json Output results in JSON format.
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-o | --openssl path/to/your/openssl binary you want to use.
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--savecrt path where to save untrusted and leaf certificates
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--curves test ECC curves supported by server (req. OpenSSL 1.0.2)
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-v | --verbose Increase verbosity.
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The rest of the arguments will be interpreted as openssl s_client argument.
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@ -529,6 +531,25 @@ display_results_in_terminal() {
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else
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echo "Client side cipher ordering"
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fi
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if [[ $TEST_CURVES == "True" ]]; then
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if [[ -n $supported_curves ]]; then
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echo
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local i=0
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(echo "prio curve"
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for curve in ${supported_curves//,/ }; do
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i=$((i+1))
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echo "$i $curve"
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done) | column -t
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echo
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if [[ $fallback_supported == True ]]; then
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echo "Server does fallback on unsupported curves"
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else
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echo "Server doesn't fallback on unsupported curves"
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fi
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echo "$curves_ordering side curve ordering"
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fi
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fi
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}
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display_results_in_json() {
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@ -553,7 +574,14 @@ display_results_in_json() {
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echo -n "\"pfs\":\"$pfs\"}"
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ctr=$((ctr+1))
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done
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echo ']}'
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echo -n ']'
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if [[ -n $supported_curves ]]; then
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echo -n ","
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echo -n "\"curve_fallback\":\"$fallback_supported\","
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echo -n "\"curve_ordering\":\"$curves_ordering\","
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echo -n "\"curve\":[\"${supported_curves//,/\",\"}\"]"
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fi
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echo '}'
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}
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test_serverside_ordering() {
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@ -609,6 +637,248 @@ test_serverside_ordering() {
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fi
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}
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test_ecc_curves() {
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# openssl formated list of curves that will cause server to select ECC suite
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local ecc_ciphers=""
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# names of all curves supported in TLS (as supported by openssl)
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local curves=()
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# alternative names for curves in TLS (as returned by openssl s_client or
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# as specified in standard)
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local curve_names=()
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# "True" if server supports ciphers that don't use ECC at a lower priority
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local fallback_available="False"
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# return variable: list of curves supported by server, in order
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supported_curves=""
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# return variable: whatever a server will fall back to non ECC suite when
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# client doesn't advertise support for curves the server needs
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fallback_supported="False"
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# return variable: check if server uses server side or client side ordering
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# for curves
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curves_ordering="server"
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# get ciphers that will cause server to select suite that uses ECC, if most
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# preferred ciphers do not, exclude them from list
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for pref in "${cipherspref[@]}"; do
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# get first value from space separated array
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cipher=($pref)
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# ECDH uses curve from certificate, so no way to negotiate it, the two
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# below are ephemeral so they can select the curve independent of cert
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if [[ $cipher =~ ECDHE ]] || [[ $cipher =~ AECDH ]]; then
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# colon on end of string is ignored by openssl
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ecc_ciphers+="${cipher}:"
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elif [[ -n $ecc_ciphers ]]; then
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# add fallback ciphers
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ecc_ciphers+="${cipher}:"
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fallback_available="True"
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fi
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done
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if [[ -z $ecc_ciphers ]]; then
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verbose "Server does not support ephemeral ECC"
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return
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fi
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verbose "ECC curves testing, cipher preference: $ecc_ciphers"
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# only some curves have defined TLS code points, so no use parsing openssl
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# output checking what it supports, see
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# http://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-8
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curves=(sect163k1 # K-163
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sect163r1
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sect163r2 # B-163
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sect193r1
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sect193r2
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sect233k1 # K-233
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sect233r1 # B-233
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sect239k1
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sect283k1 # K-283
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sect283r1 # B-283
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sect409k1 # K-409
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sect409r1 # B-409
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sect571k1 # K-571
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sect571r1 # B-571
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secp160k1
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secp160r1
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secp160r2
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secp192k1
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prime192v1 # P-192 secp192r1
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secp224k1
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secp224r1 # P-224
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secp256k1
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prime256v1 # P-256 secp256r1
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secp384r1 # P-384
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secp521r1 # P-521
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brainpoolP256r1
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brainpoolP384r1
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brainpoolP512r1)
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# many curves have alternative names, save those too
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curve_names=("sect163k1 K-163"
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"sect163r1"
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"sect163r2 B-163"
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"sect193r1"
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"sect193r2"
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"sect233k1 K-233"
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"sect233r1 B-233"
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"sect239k1"
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"sect283k1 K-283"
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"sect283r1 B-283"
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"sect409k1 K-409"
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"sect409r1 B-409"
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"sect571k1 K-571"
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"sect571r1 B-571"
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"secp160k1"
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"secp160r1"
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"secp160r2"
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"secp192k1"
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"prime192v1 P-192 secp192r1"
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"secp224k1"
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"secp224r1 P-224"
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"secp256k1"
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"prime256v1 P-256 secp256r1"
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"secp384r1 P-384"
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"secp521r1 P-521"
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"brainpoolP256r1"
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"brainpoolP384r1"
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"brainpoolP512r1")
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OLDIFS="$IFS"
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IFS=':'
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verbose "Will test following curves: ${curves[*]}"
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IFS="$OLDIFS"
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# prepare the ssl command we'll be using
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local sslcommand=""
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sslcommand="$TIMEOUTBIN $TIMEOUT $OPENSSLBIN s_client"
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if [ -n "$CAPATH" ]; then
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sslcommand+=" -CApath $CAPATH -showcerts"
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elif [ -e "$CACERTS" ]; then
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sslcommand+=" -CAfile $CACERTS"
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fi
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sslcommand+=" -status $SCLIENTARGS -connect $TARGET -cipher $ecc_ciphers"
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#
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# here we use the same logic as with detecting cipher suites: first
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# advertise all curves as supported, then remove curves one by one until we
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# either get a fallback to a non ECC cipher, we run of curves or server
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# tries to negotiate a curve we didn't advertise
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#
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while [[ ${#curves[@]} -gt 0 ]]; do
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OLDIFS="$IFS"
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IFS=':'
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local test_curves="${curves[*]}"
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IFS="$OLDIFS"
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verbose "Testing $test_curves"
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ratelimit
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local tmp=$(echo Q | $sslcommand -curves $test_curves 2>/dev/null)
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parse_openssl_output <<<"$tmp"
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if [[ -z $current_protocol || $current_cipher == "(NONE)" \
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|| $current_cipher == '0000' ]]; then
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# server aborted connection
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if [[ $fallback_available == "True" ]]; then
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fallback_supported="False"
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else
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fallback_supported="unknown"
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fi
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break
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else
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# server accepted connection
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local ephem_data=(${current_pfs//,/ })
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if [[ ${ephem_data[0]} =~ ECDH ]]; then
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# ok, we got an ECC connection, now, what curve did we get
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for id in "${!curves[@]}"; do
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# compare to alternative names
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if [[ ${curve_names[$id]} =~ ${ephem_data[1]} ]]; then
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if [[ -n $supported_curves ]]; then
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supported_curves+=","
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fi
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supported_curves+="${curves[$id]}"
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verbose "Server selected ${ephem_data[1]}, a.k.a ${curves[$id]}"
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# ok, we know it's supported, remove it from set of offered ones
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unset curves[$id]
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break
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fi
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done
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else
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verbose "Server fell back to $current_cipher"
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# ok, we got a fallback
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fallback_supported="True"
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break
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fi
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fi
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[ "$OUTPUTFORMAT" == "terminal" ] && [ $DEBUG -lt 1 ] && echo -n '.'
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done
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# don't penalize servers that will negotiate all curves we know of...
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if [[ ${#curves[@]} -eq 0 ]]; then
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fallback_supported="unknown"
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fi
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#
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# check if curves ordering is server of client side
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#
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local tmp_curves=(${supported_curves//,/ })
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verbose "Server supported curves: ${tmp_curves[@]}"
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# server supports just one or none, so it effectively uses server side
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# ordering (as it dictates what curves client must support)
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if [ ${#tmp_curves[@]} -lt 2 ]; then
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curves_ordering="server"
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else
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# server supports at least 2 curves, rotate their order, see if
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# selected changes
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test_curves=""
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most_wanted="${tmp_curves[${#tmp_curves[@]}-1]}"
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for (( i=${#tmp_curves[@]}-1; i>0; i--)); do
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test_curves+="${tmp_curves[$i]}:"
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done
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test_curves+="${tmp_curves[0]}"
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verbose "Testing ordering with $sslcommand -curves $test_curves"
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ratelimit
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local tmp=$(echo Q | $sslcommand -curves $test_curves 2>/dev/null)
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parse_openssl_output <<<"$tmp"
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if [[ -z $current_protocol || $current_cipher == "(NONE)" \
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|| $current_cipher == '0000' ]]; then
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fallback_supported="order-specific"
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verbose "Server aborted connection"
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else
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local ephem_data=(${current_pfs//,/ })
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verbose "Server selected $current_cipher with $current_pfs"
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verbose "ephem_data: ${ephem_data[@]}"
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if [[ ${ephem_data[0]} =~ ECDH ]]; then
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verbose "Server did select ${ephem_data[1]} curve"
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curves_ordering="inconclusive-${ephem_data[1]}"
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for id in "${!curve_names[@]}"; do
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if [[ ${curve_names[$id]} =~ ${ephem_data[1]} ]]; then
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local canonic_name=(${curve_names[$id]})
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if [[ ${canonic_name[0]} == $most_wanted ]]; then
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curves_ordering="client"
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break
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else
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curves_ordering="server"
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break
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fi
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fi
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done
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else
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# some servers downgrade to non ECDH when curve order is changed
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curves_ordering="inconclusive-noecc"
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fi
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fi
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fi
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}
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# If no options are given, give usage information and exit (with error code)
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if [ $# -eq 0 ]; then
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usage;
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@ -664,6 +934,10 @@ do
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SAVECRT="$2"
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shift 2
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;;
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--curves)
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TEST_CURVES="True"
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shift 1
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;;
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--) # End of all options
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shift
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break
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@ -723,6 +997,10 @@ get_cipher_pref $CIPHERSUITE
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test_serverside_ordering
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if [[ $TEST_CURVES == "True" ]]; then
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test_ecc_curves
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fi
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if [ "$OUTPUTFORMAT" == "json" ]; then
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display_results_in_json
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else
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@ -72,6 +72,9 @@ handshakestats = defaultdict(int)
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keysize = defaultdict(int)
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sigalg = defaultdict(int)
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tickethint = defaultdict(int)
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eccfallback = defaultdict(int)
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eccordering = defaultdict(int)
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ecccurve = defaultdict(int)
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ocspstaple = defaultdict(int)
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dsarsastack = 0
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total = 0
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@ -86,6 +89,9 @@ for r,d,flist in os.walk(path):
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tempdsakeystats = {}
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tempsigstats = {}
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tempticketstats = {}
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tempeccfallback = "unknown"
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tempeccordering = "unknown"
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tempecccurve = {}
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""" supported ciphers by the server under scan """
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tempcipherstats = {}
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ciphertypes = 0
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@ -141,6 +147,17 @@ for r,d,flist in os.walk(path):
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if len(results['ciphersuite']) < 1:
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continue
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""" save ECC curve stats """
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if 'curve_fallback' in results:
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tempeccfallback = results['curve_fallback']
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if 'curve_ordering' in results:
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tempeccordering = results['curve_ordering']
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if 'curve' in results:
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for curve in results['curve']:
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tempecccurve[curve] = 1
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if len(results['curve']) == 1:
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tempecccurve[curve + ' Only'] = 1
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""" loop over list of ciphers """
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for entry in results['ciphersuite']:
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@ -329,6 +346,11 @@ for r,d,flist in os.walk(path):
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for s in tempticketstats:
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tickethint[s] += 1
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eccfallback[tempeccfallback] += 1
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eccordering[tempeccordering] += 1
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for s in tempecccurve:
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ecccurve[s] += 1
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if ocsp_stapling is None:
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ocspstaple['Unknown'] += 1
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elif ocsp_stapling:
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@ -518,6 +540,24 @@ for stat in sorted(pfsstats):
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pfspercent = round(pfsstats[stat] / handshakestats['DHE'] * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(pfsstats[stat]).ljust(10) + str(percent).ljust(9) + str(pfspercent) + "\n")
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print("\nSupported ECC curves Count Percent ")
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print("-------------------------+---------+--------")
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for stat in sorted(ecccurve):
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percent = round(ecccurve[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(ecccurve[stat]).ljust(10) + str(percent).ljust(9) + "\n")
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print("\nUnsupported curve fallback Count Percent ")
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print("------------------------------+---------+--------")
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for stat in sorted(eccfallback):
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percent = round(eccfallback[stat] / total * 100,4)
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sys.stdout.write(stat.ljust(30) + " " + str(eccfallback[stat]).ljust(10) + str(percent).ljust(9) + "\n")
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print("\nECC curve ordering Count Percent ")
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print("-------------------------+---------+--------")
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for stat in sorted(eccordering):
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percent = round(eccordering[stat] / total * 100, 4)
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sys.stdout.write(stat.ljust(25) + " " + str(eccordering[stat]).ljust(10) + str(percent).ljust(9) + "\n")
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print("\nTLS session ticket hint Count Percent ")
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print("-------------------------+---------+--------")
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for stat in natural_sort(tickethint):
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@ -68,7 +68,7 @@ function scan_host() {
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if [ $? -gt 0 ]; then
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return
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fi
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../cipherscan --capath ca_files --saveca --savecrt certs --delay 2 -json -servername $1 $2:443 > results/$1@$2
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../cipherscan --capath ca_files --saveca --curves --savecrt certs --delay 2 -json -servername $1 $2:443 > results/$1@$2
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}
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function scan_host_no_sni() {
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@ -80,7 +80,7 @@ function scan_host_no_sni() {
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if [ $? -gt 0 ]; then
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return
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fi
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../cipherscan --capath ca_files --saveca --savecrt certs --delay 2 -json $1:443 > results/$1
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../cipherscan --capath ca_files --saveca --curves --savecrt certs --delay 2 -json $1:443 > results/$1
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}
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function scan_hostname() {
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