Check TLS 1.3 support in 0rtt-check command

SOURCES/webkaos-utils

@@ -208,7 +208,7 @@ checkOCSP() {
   host="$1"
   server_name="${2:-$host}"
   tmp_file=$(mktemp -u "$TMP_PATTERN")
-  status=$(openssl s_client -servername "$server_name" -connect "$host:443" -tls1_1 -tlsextdebug -status 2>&1 < /dev/null &> "$tmp_file")
+  status=$(openssl s_client -servername "$server_name" -connect "$host:443" -tls1 -tlsextdebug -status 2>&1 < /dev/null &> "$tmp_file")
 
   if [[ $(grep 'OCSP Response Status: successful' "$tmp_file") == "" ]] ; then
     show "OCSP Response Status: ${CL_RED}No response sent${CL_NORM}"
@@ -231,6 +231,11 @@ checkRTT() {
     usage && exit 0
   fi
 
+  if ! isProtocolSupported "TLSv1.3" ; then
+    error "Installed OpenSSL version doesn't support TLS 1.3"
+    exit 1
+  fi
+
   local host req_temp status
 
   host="$1"
@@ -427,6 +432,16 @@ sigExitTrap() {
   doExit 1
 }
 
+# Checks if installed OpenSSL version supported given protocol
+#
+# 1: Protocol (String)
+#
+# Code: Yes
+# Echo: No
+isProtocolSupported() {
+  openssl ciphers -v | tr -s " " | cut -f2 -d" " | grep "$1"
+}
+
 # Remove temporary data and exit with given exit code
 #
 # 1: Exit code (Number) [Optional]