SESSION_SSL=NEVER (#137)

Author: najohnsn

tnz/tnz.py

@@ -98,6 +98,7 @@ def __init__(self, name=None):
         self.__secure = False
         self.__cert_verified = False
         self.__start_tls_hostname = None
+        self.__start_tls_completed = False
         self.__host_verified = False
         self._event = None
         self.__loop = None
@@ -2144,7 +2145,11 @@ def _process(self, data):
                     self.send_do(25, buffer=True)
 
             elif data[2] == 46:  # START_TLS
-                if not hasattr(self.__loop, "start_tls"):
+                if os.environ.get("SESSION_SSL") == "NEVER":
+                    self.__log_info("START_TLS SESSION_SSL=NEVER.")
+                    self.send_wont(data[2], buffer=True)
+
+                elif not hasattr(self.__loop, "start_tls"):
                     self._log_warn("START_TLS unsupported.")
                     self._log_warn("Python >= 3.7 required")
                     self.send_wont(data[2], buffer=True)
@@ -4502,6 +4507,7 @@ async def __start_tls(self, context):
 
         else:
             self._transport = transport
+            self.__start_tls_completed = True
             self.__secure = True
             if context.verify_mode == ssl.CERT_REQUIRED:
                 self.__cert_verified = True
@@ -4764,6 +4770,12 @@ def secure(self):
         """
         return self.__secure
 
+    @property
+    def start_tls_completed(self):
+        """Bool indicating if start_tls completed.
+        """
+        return self.__start_tls_completed
+
     @property
     def tn3270(self):
         """Bool indicating if NOT NVT mode.

tnz/zti.py

@@ -780,13 +780,19 @@ def do_session(self, arg):
             elif tns.cert_verified:
                 verify = "cert"
 
+            session_ssl = int(not tns.start_tls_completed)
             if verify:
+                if not session_ssl:
+                    print(f" SESSION_SSL=0")
+
                 print(f" SESSION_SSL_VERIFY={verify}")
             else:
-                print(f" SESSION_SSL=1")
+                if session_ssl:
+                    print(f" SESSION_SSL=1")
+
                 print(f" SESSION_SSL_VERIFY=none")
         else:
-            print(f" SESSION_SSL=0")
+            print(f" SESSION_SSL=NEVER")
 
         print(f" SESSION_TN_ENHANCED={tns.tn3270e:d}")
         print(f" SESSION_DEVICE_TYPE={tns.terminal_type}")