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Modified ssl renegotiation attempts to be variable, and default 6.

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j
2020-10-19 22:12:59 +02:00
parent e51301d9ee
commit e82d4e07ca
2 changed files with 13 additions and 7 deletions
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1
CREDITS.md
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@@ -41,6 +41,7 @@ Full contribution, see git log.
* Jim Blankendaal * Jim Blankendaal
- maximum certificate lifespan of 398 days - maximum certificate lifespan of 398 days
- ssl renegotiation amount variable
* Frank Breedijk * Frank Breedijk
- Detection of insecure redirects - Detection of insecure redirects

17
testssl.sh
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@@ -231,6 +231,7 @@ fi
DISPLAY_CIPHERNAMES="openssl" # display OpenSSL ciphername (but both OpenSSL and RFC ciphernames in wide mode) DISPLAY_CIPHERNAMES="openssl" # display OpenSSL ciphername (but both OpenSSL and RFC ciphernames in wide mode)
declare UA_STD="TLS tester from $SWURL" declare UA_STD="TLS tester from $SWURL"
declare -r UA_SNEAKY="Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0" declare -r UA_SNEAKY="Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0"
SSL_RENEG_ATTEMPTS=${SSL_RENEG_ATTEMPTS:-6} # number of times to check SSL Renegotiation
########### Initialization part, further global vars just being declared here ########### Initialization part, further global vars just being declared here
# #
@@ -15969,6 +15970,7 @@ run_renego() {
local cwe="CWE-310" local cwe="CWE-310"
local hint="" local hint=""
local jsonID="" local jsonID=""
local ssl_reneg_attempts=$SSL_RENEG_ATTEMPTS
# No SNI needed here as there won't be two different SSL stacks for one IP # No SNI needed here as there won't be two different SSL stacks for one IP
"$HAS_TLS13" && [[ -z "$proto" ]] && proto="-no_tls1_3" "$HAS_TLS13" && [[ -z "$proto" ]] && proto="-no_tls1_3"
@@ -16074,24 +16076,27 @@ run_renego() {
fi fi
case "$sec_client_renego" in case "$sec_client_renego" in
0) # We try again if server is HTTP. This could be either a node.js server or something else. 0) # We try again if server is HTTP. This could be either a node.js server or something else.
# node.js has a mitigation which allows 3x R and then blocks. So we test 4x # 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.
# This way we save a couple seconds as we weeded out the ones which are more robust # 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 if [[ $SERVICE != HTTP ]]; then
pr_svrty_medium "VULNERABLE (NOT ok)"; outln ", potential DoS threat" pr_svrty_medium "VULNERABLE (NOT ok)"; outln ", potential DoS threat"
fileout "$jsonID" "MEDIUM" "VULNERABLE, potential DoS threat" "$cve" "$cwe" "$hint" fileout "$jsonID" "MEDIUM" "VULNERABLE, potential DoS threat" "$cve" "$cwe" "$hint"
else else
(for i in {1..4}; do echo R; sleep 1; done) | \ (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 $PROXY") >$TMPFILE 2>>$ERRFILE $OPENSSL s_client $(s_client_options "$proto $legacycmd $STARTTLS $BUGS -connect $NODEIP:$PORT $PROXY") >$TMPFILE 2>>$ERRFILE
case $? in case $? in
0) pr_svrty_high "VULNERABLE (NOT ok)"; outln ", DoS threat" 0) pr_svrty_high "VULNERABLE (NOT ok)"; outln ", DoS threat ($ssl_reneg_attempts attempts)"
fileout "$jsonID" "HIGH" "VULNERABLE, DoS threat" "$cve" "$cwe" "$hint" fileout "$jsonID" "HIGH" "VULNERABLE, DoS threat" "$cve" "$cwe" "$hint"
;; ;;
1) pr_svrty_good "not vulnerable (OK)" 1) pr_svrty_good "not vulnerable (OK)"
outln " -- mitigated" outln " -- mitigated (disconnect within $ssl_reneg_attempts)"
fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe" fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe"
;; ;;
*) prln_warning "FIXME (bug): $sec_client_renego (4 tries)" *) prln_warning "FIXME (bug): $sec_client_renego ($ssl_reneg_attempts tries)"
fileout "$jsonID" "DEBUG" "FIXME (bug 4 tries) $sec_client_renego" "$cve" "$cwe" fileout "$jsonID" "DEBUG" "FIXME (bug $ssl_reneg_attempts tries) $sec_client_renego" "$cve" "$cwe"
ret=1 ret=1
;; ;;
esac esac