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- FIX #189 with a smart check, introduced global var SERVER_SIZE_LIMIT_BUG

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- introduced "has_server_protocol()" which can be used to check b4 connecting if protocol is a/v
This commit is contained in:
Dirk 2016-06-09 11:04:40 +02:00
parent 94d5a8df80
commit 5ceace33e0
1 changed files with 32 additions and 15 deletions
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47
testssl.sh
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@ -151,7 +151,7 @@ JSONFILE=${JSONFILE:-""} # jsonfile if used
CSVFILE=${CSVFILE:-""} # csvfile if used
HAS_IPv6=${HAS_IPv6:-false} # if you have OpenSSL with IPv6 support AND IPv6 networking set it to yes
UNBRACKTD_IPV6=${UNBRACKTD_IPV6:-false} # some versions of OpenSSL (like Gentoo) don't support [bracketed] IPv6 addresses
SIZELMT_W_ARND=${SIZELMT_W_ARND:-false} # workaround for servers which have either a ClientHello total size limit or cipher limit of ~128 ciphers (e.g. old ASAs)
SERVER_SIZE_LIMIT_BUG=false # Some servers have either a ClientHello total size limit or cipher limit of ~128 ciphers (e.g. old ASAs)
# tuning vars, can not be set by a cmd line switch
EXPERIMENTAL=${EXPERIMENTAL:-false}
@ -2226,6 +2226,15 @@ add_tls_offered() {
grep -w "$1" <<< "$PROTOS_OFFERED" || PROTOS_OFFERED+="$1 "
}
# function which checks whether SSLv2 - TLS 1.2 is being offereed
has_server_protocol() {
[[ -z "$PROTOS_OFFERED" ]] && return 0 # if empty we rather return 0, means check at additional cost=connect will be done
if grep -w "$1" <<< "$PROTOS_OFFERED"; then
return 0
fi
return 1
}
# the protocol check needs to be revamped. It sucks, see above
run_protocols() {
@ -2237,8 +2246,6 @@ run_protocols() {
outln; pr_headline " Testing protocols "
via="Protocol tested "
#FIXME: use PROTOS_OFFERED here
if $SSL_NATIVE; then
using_sockets=false
pr_headlineln "(via native openssl)"
@ -2258,7 +2265,7 @@ run_protocols() {
pr_bold " SSLv2 ";
if ! $SSL_NATIVE; then
sslv2_sockets #FIXME: messages need to be moved to this higher level
sslv2_sockets #FIXME: messages/output need to be moved to this (higher) level
else
run_prototest_openssl "-ssl2"
case $? in
@ -2278,7 +2285,7 @@ run_protocols() {
;;
7)
fileout "sslv2" "INFO" "SSLv2 is not tested due to lack of local support"
;; # no local support
;; # no local support
esac
fi
@ -2324,11 +2331,11 @@ run_protocols() {
outln "offered"
fileout "tls1" "INFO" "TLSv1.0 is offered"
add_tls_offered "tls1"
;; # nothing wrong with it -- per se
;; # nothing wrong with it -- per se
1)
outln "not offered"
fileout "tls1" "INFO" "TLSv1.0 is not offered"
;; # neither good or bad
;; # neither good or bad
2)
pr_svrty_medium "not offered"
[[ $DEBUG -eq 1 ]] && out " -- downgraded"
@ -2785,19 +2792,21 @@ check_tls12_pref() {
cipher_pref_check() {
local p proto protos npn_protos
local tested_cipher cipher order
local overflow_probe_cipherlist="ALL:-ECDHE-RSA-AES256-GCM-SHA384:-AES128-SHA:-DES-CBC3-SHA"
pr_bold " Cipher order"
for p in ssl2 ssl3 tls1 tls1_1 tls1_2; do
order=""
if [[ $p == ssl2 ]] && ! "$HAS_SSL2"; then
out "\n SSLv2: "; local_problem "$OPENSSL doesn't support \"s_client -ssl2\"";
out "\n SSLv2: "; local_problem "$OPENSSL doesn't support \"s_client -ssl2\"";
continue
fi
if [[ $p == ssl3 ]] && ! "$HAS_SSL3"; then
out "\n SSLv3: "; local_problem "$OPENSSL doesn't support \"s_client -ssl3\"";
out "\n SSLv3: "; local_problem "$OPENSSL doesn't support \"s_client -ssl3\"";
continue
fi
# with the supplied binaries SNI works also for SSLv2 (+ SSLv3)
$OPENSSL s_client $STARTTLS -"$p" $BUGS -connect $NODEIP:$PORT $PROXY $SNI </dev/null 2>$ERRFILE >$TMPFILE
if sclient_connect_successful $? $TMPFILE; then
tested_cipher=""
@ -2808,12 +2817,19 @@ cipher_pref_check() {
printf " %-10s" "$proto: "
tested_cipher="-"$cipher
order="$cipher"
if [[ $p == tls1_2 ]] && "$SIZELMT_W_ARND"; then
# for some servers the ServerHello is limited to 128 ciphers or the ServerHello itself has a length restriction
# thus we reduce the number of ciphers we throw at the server and put later everything together
# see #189
# so far, this was only observed in TLS 1.2
if [[ $p == tls1_2 ]]; then
# for some servers the ClientHello is limited to 128 ciphers or the ClientHello itself has a length restriction.
# So far, this was only observed in TLS 1.2, affected are e.g. old Cisco LBs or ASAs, see issue #189
# To check whether a workaround is needed we send a laaarge list of ciphers/big client hello. If connect fails,
# we hit the bug and automagically do the workround. Cost: this is for all servers only 1x more connect
$OPENSSL s_client $STARTTLS -tls1_2 $BUGS -cipher "$overflow_probe_cipherlist" -connect $NODEIP:$PORT $PROXY $SNI </dev/null 2>>$ERRFILE >$TMPFILE
if ! sclient_connect_successful $? $TMPFILE; then
SERVER_SIZE_LIMIT_BUG=true
fi
fi
if [[ $p == tls1_2 ]] && "$SERVER_SIZE_LIMIT_BUG"; then
order=$(check_tls12_pref "$cipher")
out "$order"
else
out " $cipher" # this is the first cipher for protocol
while true; do
@ -7314,6 +7330,7 @@ reset_hostdepended_vars() {
TLS_EXTENSIONS=""
PROTOS_OFFERED=""
OPTIMAL_PROTO=""
SERVER_SIZE_LIMIT_BUG=false
}
@ -7453,4 +7470,4 @@ fi
exit $?
# $Id: testssl.sh,v 1.496 2016/06/07 21:06:57 dirkw Exp $
# $Id: testssl.sh,v 1.498 2016/06/09 09:04:39 dirkw Exp $