Add cli option --tls-version to control tls version used

README.md

@@ -76,6 +76,9 @@ $ sudo apt-get install mycli # Only on debian or ubuntu
       --ssl-cert PATH               X509 cert in PEM format.
       --ssl-key PATH                X509 key in PEM format.
       --ssl-cipher TEXT             SSL cipher to use.
+      --tls-version [TLSv1|TLSv1.1|TLSv1.2|TLSv1.3]
+                                    TLS protocol version for secure connection.
+
       --ssl-verify-server-cert      Verify server's "Common Name" in its cert
                                     against hostname used when connecting. This
                                     option is disabled by default.

changelog.md

@@ -55,6 +55,10 @@ Features:
 * Add prettify/unprettify keybindings to format the current statement using `sqlglot`.
 
 
+Features:
+---------
+* Add `--tls-version` option to control the tls version used.
+
 Internal:
 ---------
 * Pin `cryptography` to suppress `paramiko` warning, helping CI complete and presumably affecting some users.

mycli/main.py

@@ -1137,6 +1137,9 @@ def get_last_query(self):
 @click.option('--ssl-key', help='X509 key in PEM format.',
               type=click.Path(exists=True))
 @click.option('--ssl-cipher', help='SSL cipher to use.')
+@click.option('--tls-version',
+              type=click.Choice(['TLSv1', 'TLSv1.1', 'TLSv1.2', 'TLSv1.3'], case_sensitive=False),
+              help='TLS protocol version for secure connection.')
 @click.option('--ssl-verify-server-cert', is_flag=True,
               help=('Verify server\'s "Common Name" in its cert against '
                     'hostname used when connecting. This option is disabled '
@@ -1188,8 +1191,8 @@ def cli(database, user, host, port, socket, password, dbname,
         version, verbose, prompt, logfile, defaults_group_suffix,
         defaults_file, login_path, auto_vertical_output, local_infile,
         ssl_enable, ssl_ca, ssl_capath, ssl_cert, ssl_key, ssl_cipher,
-        ssl_verify_server_cert, table, csv, warn, execute, myclirc, dsn,
-        list_dsn, ssh_user, ssh_host, ssh_port, ssh_password,
+        tls_version, ssl_verify_server_cert, table, csv, warn, execute,
+        myclirc, dsn, list_dsn, ssh_user, ssh_host, ssh_port, ssh_password,
         ssh_key_filename, list_ssh_config, ssh_config_path, ssh_config_host,
         init_command, charset, password_file):
     """A MySQL terminal client with auto-completion and syntax highlighting.
@@ -1248,6 +1251,7 @@ def cli(database, user, host, port, socket, password, dbname,
             'key': ssl_key and os.path.expanduser(ssl_key),
             'capath': ssl_capath,
             'cipher': ssl_cipher,
+            'tls_version': tls_version,
             'check_hostname': ssl_verify_server_cert,
             }
 

mycli/sqlexecute.py

@@ -156,7 +156,7 @@
             '\tssh_key_filename: %r'
             '\tinit_command: %r',
             db, user, host, port, socket, charset, local_infile, ssl,
             ssh_user, ssh_host, ssh_port, ssh_password, ssh_key_filename,
             init_command
         )
         conv = conversions.copy()
@@ -176,11 +176,15 @@
         if init_command and len(list(special.split_queries(init_command))) > 1:
             client_flag |= pymysql.constants.CLIENT.MULTI_STATEMENTS
 
+        ssl_context = None
+        if ssl:
+            ssl_context = self._create_ssl_ctx(ssl)
+
         conn = pymysql.connect(
             database=db, user=user, password=password, host=host, port=port,
             unix_socket=socket, use_unicode=True, charset=charset,
             autocommit=True, client_flag=client_flag,
-            local_infile=local_infile, conv=conv, ssl=ssl, program_name="mycli",
+            local_infile=local_infile, conv=conv, ssl=ssl_context, program_name="mycli",
             defer_connect=defer_connect, init_command=init_command
         )
 
@@ -354,3 +358,40 @@
     def change_db(self, db):
         self.conn.select_db(db)
         self.dbname = db
+
+    def _create_ssl_ctx(self, sslp):
+        import ssl
+
+        ca = sslp.get("ca")
+        capath = sslp.get("capath")
+        hasnoca = ca is None and capath is None
+        ctx = ssl.create_default_context(cafile=ca, capath=capath)
+        ctx.check_hostname = not hasnoca and sslp.get("check_hostname", True)
+        ctx.verify_mode = ssl.CERT_NONE if hasnoca else ssl.CERT_REQUIRED
+        if "cert" in sslp:
+            ctx.load_cert_chain(sslp["cert"], keyfile=sslp.get("key"))
+        if "cipher" in sslp:
+            ctx.set_ciphers(sslp["cipher"])
+
+        # raise this default to v1.1 or v1.2?
+        ctx.minimum_version = ssl.TLSVersion.TLSv1
+
+        if "tls_version" in sslp:
+            tls_version = sslp["tls_version"]
+
+            if tls_version == "TLSv1":
+                ctx.minimum_version = ssl.TLSVersion.TLSv1
+                ctx.maximum_version = ssl.TLSVersion.TLSv1
+            elif tls_version == "TLSv1.1":
+                ctx.minimum_version = ssl.TLSVersion.TLSv1_1
+                ctx.maximum_version = ssl.TLSVersion.TLSv1_1
+            elif tls_version == "TLSv1.2":
+                ctx.minimum_version = ssl.TLSVersion.TLSv1_2
+                ctx.maximum_version = ssl.TLSVersion.TLSv1_2
+            elif tls_version == "TLSv1.3":
+                ctx.minimum_version = ssl.TLSVersion.TLSv1_3
+                ctx.maximum_version = ssl.TLSVersion.TLSv1_3
+            else:
+                _logger.error('Invalid tls version: %s', tls_version)
+
+        return ctx