cipher specification cleanup

https://trac.gajim.org/ticket/7599

src/common/config.py

@@ -349,7 +349,7 @@ class Config:
                     'enable_esessions': [opt_bool, True, _('Enable ESessions encryption for this account.')],
                     'autonegotiate_esessions': [opt_bool, True, _('Should Gajim automatically start an encrypted session when possible?')],
                     'connection_types': [ opt_str, 'tls ssl plain', _('Ordered list (space separated) of connection type to try. Can contain tls, ssl or plain')],
-                    'cipher_list': [ opt_str, 'HIGH:!aNULL:!eNULL:RC4-SHA', '' ],
+                    'cipher_list': [ opt_str, 'HIGH:!aNULL:RC4-SHA', '' ],
                     'action_when_plaintext_connection': [ opt_str, 'warn', _('Show a warning dialog before sending password on an plaintext connection. Can be \'warn\', \'connect\', \'disconnect\'') ],
                     'warn_when_insecure_ssl_connection': [ opt_bool, True, _('Show a warning dialog before using standard SSL library.') ],
                     'warn_when_insecure_password': [ opt_bool, True, _('Show a warning dialog before sending PLAIN password over a plain connection.') ],

src/common/jingle_xtls.py

@@ -101,7 +101,7 @@ def get_context(fingerprint, verify_cb=None, remote_jid=None):
     ctx = SSL.Context(SSL.SSLv23_METHOD)
     flags = (SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3 | SSL.OP_SINGLE_DH_USE)
     ctx.set_options(flags)
-    ctx.set_cipher_list('HIGH:!aNULL:!eNULL')
+    ctx.set_cipher_list('HIGH:!aNULL:!3DES')
 
     if fingerprint == 'server': # for testing purposes only
         ctx.set_verify(SSL.VERIFY_NONE|SSL.VERIFY_FAIL_IF_NO_PEER_CERT,