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Added a check for TLS_FALLBACK_SCSV

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This commit is contained in:
JonnyHightower 2015-06-08 17:19:34 +01:00
parent 0f5c4981cb
commit 0e36255fb9
2 changed files with 38 additions and 3 deletions
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3
CREDITS.md
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@ -34,6 +34,9 @@
* Dmitri S
- inspiration & help for Darwin port
* Jonathan Roach
- TLS_FALLBACK_SCSV checks
* Bug reports:
- Viktor Szépe, Olivier Paroz, Jan H. Terstegge, Lorenz Adena

38
testssl.sh
View File

@ -9,7 +9,7 @@
# Stable version from https://testssl.sh
# Please file bugs at github! https://github.com/drwetter/testssl.sh/issues
VERSION="2.5dev"
VERSION="2.6dev"
SWURL="http://dev.testssl.sh"
SWCONTACT="dirk aet testssl dot sh"
@ -2617,6 +2617,33 @@ EOF
return $ret
}
# Test for TLS_FALLBACK_SCSV
tls_fallback_scsv() {
# This isn't a vulnerability check per se, but it is a strong countermeasure
# to protect against protocol downgrade attacks.
local TMP="/tmp"
if [ ! -z "$HOME" ] && [ -w "$HOME" ]; then
TMP="$HOME"
fi
local scsv="$TMP/.testssl_scsv.txt"
ret=1
[ $VULN_COUNT -le $VULN_THRESHLD ] && outln && pr_blue "--> Testing for TLS_FALLBACK_SCSV Support" && outln "\n"
pr_bold " TLS_FALLBACK_SCSV"; out " (RFC 7507) "
echo | $OPENSSL s_client -connect $NODEIP:$PORT -no_tls1_2 -fallback_scsv > "$scsv" 2>&1
if grep -q "CONNECTED(00" "$scsv"; then
if grep -q "alert inappropriate fallback" "$scsv"; then
pr_green "not vulnerable (OK) - supported"
ret=0
else
pr_litered "VULNERABLE (NOT ok)"; out " - not supported\n"
ret=2
fi
else
pr_magentaln "test failed (couldn't connect)"
ret=3
fi
rm -f "$scsv"
}
# Padding Oracle On Downgraded Legacy Encryption, in a nutshell: don't use CBC Ciphers in SSLv3
ssl_poodle() {
@ -3512,6 +3539,7 @@ initialize_globals() {
do_server_preference=false
do_spdy=false
do_ssl_poodle=false
do_tls_fallback_scsv=false
do_test_just_one=false
do_tls_sockets=false
}
@ -3538,6 +3566,7 @@ set_scanning_defaults() {
do_server_preference=true
do_spdy=true
do_ssl_poodle=true
do_tls_fallback_scsv=true
VULN_COUNT=10
}
@ -3547,7 +3576,7 @@ query_globals() {
for gbl in do_allciphers do_vulnerabilities do_beast do_breach do_ccs_injection do_cipher_per_proto do_crime \
do_freak do_logjam do_header do_heartbleed do_mx_all_ips do_pfs do_protocols do_rc4 do_renego \
do_run_std_cipherlists do_server_defaults do_server_preference do_spdy do_ssl_poodle \
do_run_std_cipherlists do_server_defaults do_server_preference do_spdy do_ssl_poodle do_tls_fallback_scsv \
do_test_just_one do_tls_sockets; do
[ "${!gbl}" == "true" ] && let true_nr++
done
@ -3560,7 +3589,7 @@ debug_globals() {
for gbl in do_allciphers do_vulnerabilities do_beast do_breach do_ccs_injection do_cipher_per_proto do_crime \
do_freak do_logjam do_header do_heartbleed do_rc4 do_mx_all_ips do_pfs do_protocols do_rc4 do_renego \
do_run_std_cipherlists do_server_defaults do_server_preference do_spdy do_ssl_poodle \
do_run_std_cipherlists do_server_defaults do_server_preference do_spdy do_ssl_poodle do_tls_fallback_scsv \
do_test_just_one do_tls_sockets; do
printf "%-22s = %s\n" $gbl "${!gbl}"
done
@ -3663,6 +3692,7 @@ startup() {
do_crime=true
do_breach=true
do_ssl_poodle=true
do_tls_fallback_scsv=true
do_freak=true
do_beast=true
do_rc4=true
@ -3691,6 +3721,7 @@ startup() {
;;
-O|--poodle)
do_ssl_poodle=true
do_tls_fallback_scsv=true
let "VULN_COUNT++"
;;
-F|--freak)
@ -3824,6 +3855,7 @@ lets_roll() {
${do_crime} && { crime; ret=$(($? + ret)); }
${do_breach} && { breach "$URL_PATH" ; ret=$(($? + ret)); }
${do_ssl_poodle} && { ssl_poodle; ret=$(($? + ret)); }
${do_tls_fallback_scsv} && { tls_fallback_scsv; ret=$(($? + ret)); }
${do_freak} && { freak; ret=$(($? + ret)); }
${do_logjam} && { logjam; ret=$(($? + ret)); }
${do_beast} && { beast; ret=$(($? + ret)); }