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Merge pull request #2459 from Tazmaniac/client-renego-fix

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Secure Client-Initiated Renegotiation : fixes/enhancements
This commit is contained in:
Dirk Wetter
2024-01-18 18:37:58 +01:00
committed by GitHub
parent b6fdfb1986 67c362c89a
commit ad04a90b2a
1 changed files with 42 additions and 5 deletions
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47
testssl.sh
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@@ -232,7 +232,8 @@ fi
DISPLAY_CIPHERNAMES="openssl" # display OpenSSL ciphername (but both OpenSSL and RFC ciphernames in wide mode)
declare UA_STD="TLS tester from $SWURL"
declare -r UA_SNEAKY="Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0"
SSL_RENEG_ATTEMPTS=${SSL_RENEG_ATTEMPTS:-6} # number of times to check SSL Renegotiation
SSL_RENEG_ATTEMPTS=${SSL_RENEG_ATTEMPTS:-10} # number of times to check SSL Renegotiation
SSL_RENEG_WAIT=${SSL_RENEG_WAIT:-0.25} # time between SSL Renegotiation checks
########### Initialization part, further global vars just being declared here
#
@@ -16956,6 +16957,7 @@ run_renego() {
local hint=""
local jsonID=""
local ssl_reneg_attempts=$SSL_RENEG_ATTEMPTS
local ssl_reneg_wait=$SSL_RENEG_WAIT
# In cases where there's no default host configured we need SNI here as openssl then would return otherwise an error and the test will fail
"$HAS_TLS13" && [[ -z "$proto" ]] && proto="-no_tls1_3"
@@ -17040,6 +17042,13 @@ run_renego() {
fileout "$jsonID" "WARN" "client x509-based authentication prevents this from being tested"
sec_client_renego=1
else
# We will need $ERRFILE for mitigation detection
if [[ $ERRFILE =~ dev.null ]]; then
ERRFILE=$TEMPDIR/errorfile.txt || exit $ERR_FCREATE
restore_errfile=1
else
restore_errfile=0
fi
# We need up to two tries here, as some LiteSpeed servers don't answer on "R" and block. Thus first try in the background
# msg enables us to look deeper into it while debugging
echo R | $OPENSSL s_client $(s_client_options "$proto $BUGS $legacycmd $STARTTLS -connect $NODEIP:$PORT $PROXY $SNI") >$TMPFILE 2>>$ERRFILE &
@@ -17064,21 +17073,47 @@ run_renego() {
# Mitigations (default values) for:
# - node.js allows 3x R and then blocks. So then 4x should be tested.
# - F5 BIG-IP ADS allows 5x R and then blocks. So then 6x should be tested.
# - Stormshield allows 9x and then blocks. So then 10x should be tested.
# This way we save a couple seconds as we weeded out the ones which are more robust
# Amount of times tested before breaking is set in SSL_RENEG_ATTEMPTS.
if [[ $SERVICE != HTTP ]]; then
pr_svrty_medium "VULNERABLE (NOT ok)"; outln ", potential DoS threat"
fileout "$jsonID" "MEDIUM" "VULNERABLE, potential DoS threat" "$cve" "$cwe" "$hint"
else
(for ((i=0; i < ssl_reneg_attempts; i++ )); do echo R; sleep 1; done) | \
$OPENSSL s_client $(s_client_options "$proto $legacycmd $STARTTLS $BUGS -connect $NODEIP:$PORT $PROXY $SNI") >$TMPFILE 2>>$ERRFILE
case $? in
(for ((i=0; i < ssl_reneg_attempts; i++ )); do echo R; sleep $ssl_reneg_wait; done) | \
$OPENSSL s_client $(s_client_options "$proto $legacycmd $STARTTLS $BUGS -connect $NODEIP:$PORT $PROXY $SNI") >$TMPFILE 2>>$ERRFILE &
pid=$!
( sleep $(($ssl_reneg_attempts*3)) && kill $pid && touch $TEMPDIR/was_killed ) >&2 2>/dev/null &
watcher=$!
# Trick to get the return value of the openssl command, output redirection and a timeout. Yes, some target hang/block after some tries.
wait $pid && pkill -HUP -P $watcher
tmp_result=$?
# If we are here, we have done two successful renegotiation (-2) and do the loop
loop_reneg=$(($(grep -ac '^RENEGOTIATING' $ERRFILE )-2))
if [[ -f $TEMPDIR/was_killed ]]; then
tmp_result=3
rm -f $TEMPDIR/was_killed
else
# If we got less than 2/3 successful attempts during the loop with 1s pause, we are in presence of exponential backoff.
if [[ $loop_reneg -le $(($ssl_reneg_attempts*2/3)) ]]; then
tmp_result=2
fi
fi
case $tmp_result in
0) pr_svrty_high "VULNERABLE (NOT ok)"; outln ", DoS threat ($ssl_reneg_attempts attempts)"
fileout "$jsonID" "HIGH" "VULNERABLE, DoS threat" "$cve" "$cwe" "$hint"
;;
1) pr_svrty_good "not vulnerable (OK)"; outln " -- mitigated (disconnect within $ssl_reneg_attempts)"
fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe"
;;
2) pr_svrty_good "not vulnerable (OK)"; \
outln " -- mitigated ($loop_reneg successful reneg within ${ssl_reneg_attempts} in ${ssl_reneg_attempts}x${ssl_reneg_wait}s)"
fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe"
;;
3) pr_svrty_good "not vulnerable (OK)"; \
outln " -- mitigated ($loop_reneg successful reneg within ${ssl_reneg_attempts} in $((${ssl_reneg_attempts}*3))s(timeout))"
fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe"
;;
*) prln_warning "FIXME (bug): $sec_client_renego ($ssl_reneg_attempts tries)"
fileout "$jsonID" "DEBUG" "FIXME (bug $ssl_reneg_attempts tries) $sec_client_renego" "$cve" "$cwe"
ret=1
@@ -17104,7 +17139,9 @@ run_renego() {
#
# https://www.openssl.org/news/vulnerabilities.html#y2009. It can only be tested with OpenSSL <=0.9.8k
# Insecure Client-Initiated Renegotiation is missing ==> sockets. When we complete the handshake ;-)
if [[ $restore_errfile -eq 1 ]]; then
ERRFILE="/dev/null"
fi
tmpfile_handle ${FUNCNAME[0]}.txt
return $ret
}