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Add support for TN3270/telnet STARTTLS (similar to OpenSSL's approach).

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enxio 2022-03-02 10:04:57 +01:00 committed by Dirk
parent 60885e0c15
commit 1eb5b2949e
1 changed files with 26 additions and 0 deletions
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26
testssl.sh
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@ -11159,6 +11159,29 @@ starttls_mysql_dialog() {
return $ret
}
starttls_telnet_dialog() {
debugme echo "=== starting telnet STARTTLS dialog ==="
local msg1="
, xff, xfb, x2e"
local msg2="
, xff, xfa, x2e, x01, xff, xf0
"
local tnres=""
local ret=""
socksend "${msg1}" 0 && debugme echo "${debugpad}initiated STARTTLS" &&
socksend "${msg2}" 1 &&
tnres=$(sockread_fast 20) && debugme echo "read succeeded"
[[ $DEBUG -ge 6 ]] && safe_echo "$debugpad $tnres\n"
# check for START_TLS and FOLLOWS
if [[ ${tnres:10:2} == 2E && ${tnres:12:2} == 01 ]]; then
ret=0
else
ret=1
fi
debugme echo "=== finished telnet STARTTLS dialog with ${ret} ==="
return $ret
}
# arg1: fd for socket -- which we don't use yes as it is a hassle (not clear whether it works under every bash version)
# arg2: optional: for STARTTLS additional command to be injected
# returns 6 if opening the socket caused a problem, 1 if STARTTLS handshake failed, 0: all ok
@ -11270,6 +11293,9 @@ fd_socket() {
mysql) # MySQL, see https://dev.mysql.com/doc/internals/en/x-protocol-lifecycle-lifecycle.html#x-protocol-lifecycle-tls-extension
starttls_mysql_dialog
;;
telnet) # captured from a tn3270 negotiation against a z/VM 7.2
starttls_telnet_dialog
;;
*) # we need to throw an error here -- otherwise testssl.sh treats the STARTTLS protocol as plain SSL/TLS which leads to FP
fatal "FIXME: STARTTLS protocol $STARTTLS_PROTOCOL is not supported yet" $ERR_NOSUPPORT
esac