mirror of
https://github.com/mozilla/cipherscan.git
synced 2024-11-21 14:03:41 +01:00
add test for TLSv1.2 PFS key exchange
since the signature and hash algorithm in TLSv1.2 is selectable by server and negotiated using TLS extensions, we can check what sig algs is the server willing to perform and whatever it does honour client selection it also tests what happens if the client doesn't offer any sigalgs that are necessary to use the ciphers selected by server
This commit is contained in:
Hubert Kario
parent
460f9cf1f6
commit
434b383f01
329
cipherscan
329
cipherscan
@ -4,7 +4,7 @@
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Authors: Julien Vehent [:ulfr] - 201{3,4}
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# Hubert Kario - 2014
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# Hubert Kario - 2014, 2015
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# vim: autoindent tabstop=4 shiftwidth=4 expandtab softtabstop=4 filetype=sh
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@ -207,12 +207,18 @@ TEST_TOLERANCE="True"
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SNI="True"
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# openssl formated list of curves that will cause server to select ECC suite
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ecc_ciphers=""
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TEST_KEX_SIGALG="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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declare -A cert_checksums
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# array with results of tolerance scans (TLS version, extensions, etc.)
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declare -A tls_tolerance
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# array with info on type of fallback on unknown sigalgs (or required ones)
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declare -A sigalgs_fallback
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# array with preferred sigalgs for aRSA and aECDSA ciphers
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declare -a sigalgs_preferred_rsa
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declare -a sigalgs_preferred_ecdsa
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# because running external commands like sleep incurs a fork penalty, we
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# first check if it is necessary
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@ -248,6 +254,8 @@ Use one of the options below:
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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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--[no-]curves test ECC curves supported by server (req. OpenSSL 1.0.2)
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--sigalg test signature algorithms used in TLSv1.2 ephemeral ciphers
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(req. OpenSSL 1.0.2)
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--[no-]tolerance test TLS tolerance
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--no-sni don't use Server Name Indication
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--no-colors don't use terminal colors
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@ -367,6 +375,7 @@ parse_openssl_output() {
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# clear variables in case matching doesn't hit them
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current_ocspstaple="False"
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current_cipher=""
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current_kex_sigalg=""
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current_pfs=""
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current_protocol=""
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current_tickethint="None"
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@ -402,6 +411,13 @@ parse_openssl_output() {
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continue
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fi
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# extract the signing algorithm used in TLSv1.2 ephemeral kex
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if [[ $line =~ Peer\ signing\ digest ]]; then
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local match=($line)
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current_kex_sigalg="${match[3]}"
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continue
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fi
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# extract data about selected temporary key
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if [[ $line =~ Server\ Temp\ Key ]]; then
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local match=($line)
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@ -679,6 +695,21 @@ get_cipher_pref() {
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fi
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}
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display_sigalgs_in_terminal() {
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(echo "prio sigalg"
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for sigalg in "$@"; do
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if [[ $sigalg == "MD5" ]]; then
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color="${c_red}"
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elif [[ $sigalg == "SHA1" ]]; then
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color="${c_yellow}"
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else
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color="${c_green}"
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fi
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echo -e "$cnt ${color}$sigalg${c_reset}"
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cnt=$((cnt+1))
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done )| column -t
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}
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display_results_in_terminal() {
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# Display the results
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ctr=1
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@ -693,13 +724,15 @@ display_results_in_terminal() {
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if [[ $USECOLORS == "True" && -x /usr/bin/tput ]] && tput setaf 1 >&/dev/null; then
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c_blue="\033[0;34m"
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c_green="\033[0;32m"
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c_yellow="\033[0;33m"
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c_red="\033[0;31m"
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c_reset="\033[0m"
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else
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c_reset=
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c_blue=
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c_green=
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c_yellow=
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c_red=
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c_reset=
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fi
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echo "Target: $TARGET"; echo
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@ -824,7 +857,49 @@ display_results_in_terminal() {
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echo -e "Curves ordering: $curvesordering - fallback: $fallback_supported"
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fi
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if [[ $TEST_KEX_SIGALG == "True" ]]; then
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echo
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echo "TLSv1.2 ephemeral sigalgs:"
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for auth in "ECDSA" "RSA"; do
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# not colored as neither of that results alone is good or bad
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if [[ -z ${sigalgs_fallback[$auth]} ]]; then
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echo "no PFS $auth ciphers detected"
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elif [[ ${sigalgs_fallback[$auth]} == "False" ]]; then
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echo "no PFS $auth fallback"
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elif [[ ${sigalgs_fallback[$auth]} == "intolerant" ]]; then
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echo "$auth test: intolerant of sigalg removal"
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elif [[ ${sigalgs_fallback[$auth]} =~ "pfs-" ]]; then
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echo "PFS $auth fallbacks to ${sigalgs_fallback[$auth]}"
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else
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echo "server forces ${sigalgs_fallback[$auth]} with $auth"
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fi
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done
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if [[ ${#sigalgs_preferred_ecdsa[@]} -gt 0 ]]; then
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echo
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if [[ ${sigalgs_preferred_ecdsa[0]} == "Fail" ]]; then
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echo -e "${c_red}ECDSA test failed${c_reset}"
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else
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local cnt=1
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echo "Supported PFS ECDSA signature algorithms"
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display_sigalgs_in_terminal "${sigalgs_preferred_ecdsa[@]}"
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fi
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fi
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if [[ ${#sigalgs_preferred_rsa[@]} -gt 0 ]]; then
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echo
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if [[ ${sigalgs_preferred_rsa[0]} == "Fail" ]]; then
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echo -e "${c_red}RSA test failed${c_reset}"
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else
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local cnt=1
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echo "Supported PFS RSA signature algorithms"
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display_sigalgs_in_terminal "${sigalgs_preferred_rsa[@]}"
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fi
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fi
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fi
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if [[ $TEST_TOLERANCE == "True" ]]; then
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echo
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if [[ $tls_tolerance['big-TLSv1.2'] =~ TLSv1.2 ]]; then
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echo -e "TLS Tolerance: ${c_green}yes${c_reset}"
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else
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@ -877,6 +952,40 @@ display_results_in_json() {
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if [[ $TEST_CURVES == "True" ]]; then
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echo -n ",\"curves_fallback\":\"$fallback_supported\""
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fi
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if [[ $TEST_KEX_SIGALG == "True" ]]; then
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echo -n ',"sigalgs":{'
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echo -n "\"ECDSA-fallback\":\"${sigalgs_fallback[ECDSA]}\","
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echo -n "\"RSA-fallback\":\"${sigalgs_fallback[RSA]}\""
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if [[ ${#sigalgs_preferred_ecdsa[@]} -gt 0 ]]; then
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echo -n ","
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echo -n '"ECDSA":['
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local cnt=0
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for sigalg in "${sigalgs_preferred_ecdsa[@]}"; do
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if [[ $cnt -gt 0 ]]; then
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echo -n ','
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fi
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echo -n "\"$sigalg\""
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cnt=$((cnt+1))
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done
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echo -n ']'
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fi
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if [[ ${#sigalgs_preferred_rsa[@]} -gt 0 ]]; then
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echo -n ","
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echo -n '"RSA":['
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local cnt=0
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for sigalg in "${sigalgs_preferred_rsa[@]}"; do
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if [[ $cnt -gt 0 ]]; then
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echo -n ','
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fi
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echo -n "\"$sigalg\""
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cnt=$((cnt+1))
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done
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echo -n ']'
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fi
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echo -n '}'
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fi
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echo -n ',"configs":{'
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ctr=0
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for test_name in "${!tls_tolerance[@]}"; do
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@ -1345,6 +1454,214 @@ test_tls_tolerance() {
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fi
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}
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test_kex_sigalgs() {
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local ecdsa_sigalgs=("ECDSA+SHA512" "ECDSA+SHA384" "ECDSA+SHA256"
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"ECDSA+SHA224" "ECDSA+SHA1" "ECDSA+MD5")
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local rsa_sigalgs=("RSA+SHA512" "RSA+SHA384" "RSA+SHA256"
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"RSA+SHA224" "RSA+SHA1" "RSA+MD5")
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local supported_rsa_ciphers=""
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local supported_ecdsa_ciphers=""
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local supported_ciphers=()
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# check if TLS1.2 is supported by server, as tests needs it
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# collect ciphers
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local tls12="False"
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for cipher in "${cipherspref[@]}"; do
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local ciph_data=($cipher)
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if [[ ${ciph_data[1]} =~ TLSv1.2 ]]; then
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tls12="True"
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fi
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supported_ciphers+=(${ciph_data[0]})
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done
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if [[ $tls12 == "False" ]]; then
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return
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fi
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# create cipher list for ecdsa and rsa tests that include non ephemeral
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# ciphers for fallback
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for cipher in "${supported_ciphers[@]}"; do
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if [[ $cipher =~ DHE-ECDSA ]]; then
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if [[ $supported_ecdsa_ciphers ]]; then
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supported_ecdsa_ciphers+=":"
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fi
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supported_ecdsa_ciphers+="$cipher"
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elif [[ ${supported_ecdsa_ciphers} ]]; then
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supported_ecdsa_ciphers+=":$cipher"
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fi
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if [[ $cipher =~ DHE-RSA ]]; then
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if [[ $supported_rsa_ciphers ]]; then
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supported_rsa_ciphers+=":"
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fi
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supported_rsa_ciphers+="$cipher"
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elif [[ ${supported_rsa_ciphers} ]]; then
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supported_rsa_ciphers+=":$cipher"
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fi
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done
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#
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# Test default sigalgs for aECDSA ciphers
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#
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if [[ $supported_ecdsa_ciphers ]]; then
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local sslcommand="$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+=" $SCLIENTARGS -connect $TARGET -cipher $supported_ecdsa_ciphers"
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# since some ciphers supported by server may be SSLv2 only, we need to
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# force use of TLSv1.2, otherwise openssl will send a SSLv2 compatible
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# client hello
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sslcommand+=" -no_ssl2 -no_ssl3"
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local test_ecdsa_sigalgs=("${ecdsa_sigalgs[@]}")
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local test_rsa_sigalgs=("${rsa_sigalgs[@]}")
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while true; do
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join_array_by_char ":" "${test_ecdsa_sigalgs[@]}" \
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"${test_rsa_sigalgs[@]}"
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local test_sigalgs="$joined_array"
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ratelimit
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verbose "Testing default ECDSA sig algs with $sslcommand -sigalgs $test_sigalgs"
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local tmp=$(echo Q | $sslcommand -sigalgs $test_sigalgs 2>/dev/null)
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parse_openssl_output <<<"$tmp"
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verbose "server selected $current_cipher, $current_protocol, $current_kex_sigalg"
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if [[ -z $current_protocol || $current_cipher == "(NONE)" \
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|| $current_cipher == "0000" ]]; then
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if [[ ${#test_ecdsa_sigalgs[@]} -eq 0 ]]; then
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sigalgs_fallback["ECDSA"]="False"
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else
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sigalgs_fallback["ECDSA"]="intolerant"
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fi
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break
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fi
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if [[ $current_cipher =~ DHE-ECDSA ]]; then
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if [[ -z $current_kex_sigalg ]]; then
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# if we didn't get a sigalg that means the test failed
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sigalgs_preferred_ecdsa=("Fail")
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break
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fi
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if [[ "${test_ecdsa_sigalgs[*]}" =~ "ECDSA+$current_kex_sigalg" ]]; then
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# save sigalg for reporting
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sigalgs_preferred_ecdsa+=("$current_kex_sigalg")
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# remove it from offered
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local id
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for id in "${!test_ecdsa_sigalgs[@]}"; do
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if [[ ${test_ecdsa_sigalgs[$id]} =~ $current_kex_sigalg ]]; then
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unset test_ecdsa_sigalgs[$id]
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break
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fi
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done
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# continue testing
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else
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# server selected sigalg we didn't offer
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sigalgs_fallback["ECDSA"]="$current_kex_sigalg"
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break
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fi
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elif [[ $current_cipher =~ DHE-RSA ]]; then
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# we got a fallback to a RSA based cipher
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if [[ -z $current_kex_sigalg ]]; then
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sigalgs_fallback["ECDSA"]="pfs-rsa"
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else
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sigalgs_fallback["ECDSA"]="pfs-rsa-${current_kex_sigalg}"
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fi
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break
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else
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# we got a fallback to a non PFS cipher, that's good too
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sigalgs_fallback["ECDSA"]="soft-nopfs"
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break
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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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fi
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#
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# Test default sigalgs for aRSA ciphers
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#
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if [[ ${supported_rsa_ciphers} ]]; then
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local sslcommand="$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+=" $SCLIENTARGS -connect $TARGET -cipher $supported_rsa_ciphers"
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# since some ciphers supported by server may be SSLv2 only, we need to
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# force use of TLSv1.2, otherwise openssl will send a SSLv2 compatible
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# client hello
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sslcommand+=" -no_ssl2 -no_ssl3"
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local test_ecdsa_sigalgs=("${ecdsa_sigalgs[@]}")
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local test_rsa_sigalgs=("${rsa_sigalgs[@]}")
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while true; do
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join_array_by_char ":" "${test_rsa_sigalgs[@]}" \
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"${test_ecdsa_sigalgs[@]}"
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local test_sigalgs="$joined_array"
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ratelimit
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verbose "Testing default RSA sig algs with $sslcommand -sigalgs $test_sigalgs"
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local tmp=$(echo Q | $sslcommand -sigalgs $test_sigalgs 2>/dev/null)
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parse_openssl_output <<<"$tmp"
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verbose "server selected $current_cipher, $current_protocol, $current_kex_sigalg"
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if [[ -z $current_protocol || $current_cipher == "(NONE)" \
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|| $current_cipher == "0000" ]]; then
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if [[ ${#test_rsa_sigalgs[@]} -eq 0 ]]; then
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sigalgs_fallback["RSA"]="False"
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else
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sigalgs_fallback["RSA"]="intolerant"
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fi
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break
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fi
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if [[ $current_cipher =~ DHE-RSA ]]; then
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if [[ -z $current_kex_sigalg ]]; then
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# if we didn't get a sigalg that means the test failed
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sigalgs_preferred_rsa=("Fail")
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break
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fi
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if [[ "${test_rsa_sigalgs[*]}" =~ "RSA+$current_kex_sigalg" ]]; then
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# save sigalg for reporting
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sigalgs_preferred_rsa+=("$current_kex_sigalg")
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# remove it from offered
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local id
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for id in "${!test_rsa_sigalgs[@]}"; do
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if [[ ${test_rsa_sigalgs[$id]} =~ $current_kex_sigalg ]]; then
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unset test_rsa_sigalgs[$id]
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break
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fi
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done
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# continue testing
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else
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# server selected sigalg we didn't offer
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sigalgs_fallback["RSA"]="$current_kex_sigalg"
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break
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fi
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elif [[ $current_cipher =~ DHE-ECDSA ]]; then
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# we got a fallback to an ECDSA based cipher
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if [[ -z $current_kex_sigalg ]]; then
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sigalgs_fallback["RSA"]="pfs-ecdsa"
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else
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sigalgs_fallback["RSA"]="pfs-ecdsa-${current_kex_sigalg}"
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fi
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break
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else
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# we got a fallback to a non PFS cipher, that's good too
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sigalgs_fallback["RSA"]="soft-nopfs"
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break
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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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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 (( $# == 0 )); then
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usage
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@ -1414,6 +1731,10 @@ do
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TEST_CURVES="False"
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shift 1
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;;
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--sigalg)
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TEST_KEX_SIGALG="True"
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shift 1
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;;
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--tolerance)
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TEST_TOLERANCE="True"
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shift 1
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@ -1567,6 +1888,10 @@ fi
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test_serverside_ordering
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if [[ $TEST_KEX_SIGALG == "True" ]]; then
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test_kex_sigalgs
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fi
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if [[ $TEST_CURVES == "True" ]]; then
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test_curves_fallback
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fi
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@ -135,6 +135,8 @@ fallback_ids['v2-big-TLSv1.2'] = i
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i+=1
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# 3rd padding space
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fallback_ids[' '] = i
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pfssigalgfallback = defaultdict(int)
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pfssigalgs = defaultdict(int)
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dsarsastack = 0
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total = 0
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for r,d,flist in os.walk(path):
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@ -155,6 +157,8 @@ for r,d,flist in os.walk(path):
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tempfallbacks = {}
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""" supported ciphers by the server under scan """
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tempcipherstats = {}
|
||||
temppfssigalgfallback = {}
|
||||
temppfssigalgs = {}
|
||||
ciphertypes = 0
|
||||
AESGCM = False
|
||||
AESCBC = False
|
||||
@ -249,6 +253,23 @@ for r,d,flist in os.walk(path):
|
||||
if len(results['curve']) == 1:
|
||||
tempecccurve[curve + ' Only'] = 1
|
||||
|
||||
""" collect TLSv1.2 PFS ciphersuite sigalgs """
|
||||
if 'sigalgs' in results:
|
||||
if results['sigalgs']['ECDSA-fallback']:
|
||||
temppfssigalgfallback['ECDSA ' + results['sigalgs']['ECDSA-fallback']] = 1
|
||||
if results['sigalgs']['RSA-fallback']:
|
||||
temppfssigalgfallback['RSA ' + results['sigalgs']['RSA-fallback']] = 1
|
||||
if 'RSA' in results['sigalgs'] and results['sigalgs']['RSA'][0] != 'Fail':
|
||||
for pfssigalg in results['sigalgs']['RSA']:
|
||||
temppfssigalgs['RSA-' + pfssigalg]=1
|
||||
if len(results['sigalgs']['RSA']) == 1:
|
||||
temppfssigalgs['RSA-' + results['sigalgs']['RSA'][0] + ' Only'] = 1
|
||||
if 'ECDSA' in results['sigalgs'] and results['sigalgs']['ECDSA'][0] != 'Fail':
|
||||
for pfssigalg in results['sigalgs']['ECDSA']:
|
||||
temppfssigalgs['ECDSA-' + pfssigalg]=1
|
||||
if len(results['sigalgs']['ECDSA']) == 1:
|
||||
temppfssigalgs['ECDSA-' + results['sigalgs']['ECDSA'][0] + ' Only'] = 1
|
||||
|
||||
if 'configs' in results:
|
||||
tolerance = [' '] * len(fallback_ids)
|
||||
for entry in results['configs']:
|
||||
@ -531,6 +552,11 @@ for r,d,flist in os.walk(path):
|
||||
else:
|
||||
ocspstaple['Unsupported'] += 1
|
||||
|
||||
for s in temppfssigalgfallback:
|
||||
pfssigalgfallback[s] += 1
|
||||
for s in temppfssigalgs:
|
||||
pfssigalgs[s] += 1
|
||||
|
||||
""" store cipher stats """
|
||||
if AESGCM:
|
||||
cipherstats['AES-GCM'] += 1
|
||||
@ -735,6 +761,18 @@ for stat in sorted(eccordering):
|
||||
percent = round(eccordering[stat] / total * 100, 4)
|
||||
sys.stdout.write(stat.ljust(25) + " " + str(eccordering[stat]).ljust(10) + str(percent).ljust(9) + "\n")
|
||||
|
||||
print("\nTLSv1.2 PFS supported sigalgs Count Percent ")
|
||||
print("------------------------------+---------+--------")
|
||||
for stat in sorted(pfssigalgs):
|
||||
percent = round(pfssigalgs[stat] / total * 100, 4)
|
||||
sys.stdout.write(stat.ljust(30) + " " + str(pfssigalgs[stat]).ljust(10) + str(percent).ljust(9) + "\n")
|
||||
|
||||
print("\nTLSv1.2 PFS sigalg fallback Count Percent ")
|
||||
print("------------------------------+---------+--------")
|
||||
for stat in sorted(pfssigalgfallback):
|
||||
percent = round(pfssigalgfallback[stat] / total * 100, 4)
|
||||
sys.stdout.write(stat.ljust(30) + " " + str(pfssigalgfallback[stat]).ljust(10) + str(percent).ljust(9) + "\n")
|
||||
|
||||
print("\nTLS session ticket hint Count Percent ")
|
||||
print("-------------------------+---------+--------")
|
||||
for stat in natural_sort(tickethint):
|
||||
|
||||
@ -68,7 +68,7 @@ function scan_host() {
|
||||
if [ $? -gt 0 ]; then
|
||||
return
|
||||
fi
|
||||
../cipherscan --capath ca_files --saveca --curves --savecrt certs --delay 2 -json -servername $1 $2:443 > results/$1@$2
|
||||
../cipherscan --capath ca_files --saveca --curves --savecrt certs --delay 2 --sigalg -json -servername $1 $2:443 > results/$1@$2
|
||||
}
|
||||
|
||||
function scan_host_no_sni() {
|
||||
@ -80,7 +80,7 @@ function scan_host_no_sni() {
|
||||
if [ $? -gt 0 ]; then
|
||||
return
|
||||
fi
|
||||
../cipherscan --capath ca_files --saveca --curves --savecrt certs --delay 2 -json $1:443 > results/$1
|
||||
../cipherscan --capath ca_files --saveca --curves --savecrt certs --delay 2 --sigalg -json $1:443 > results/$1
|
||||
}
|
||||
|
||||
function scan_hostname() {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user