diff roundup/mailer.py @ 7968:d7e79f8eb943

issue2551350 - Python changes for 3.12 with roundup 2.3.0 mailer.py Fix due to change in smtplib.SMTP.starttls() signature. As of 3.3 it can use an optional ssl context argument for certificates/keys. In 3.12 it dropped legacy support for specifing cert/key files as arguments and requires a context. I modified Andrew's original patch to initialize SSLContext with ssl.PROTOCOL_TLS_CLIENT. If there is a cert file specified, enable check_hostname - verify that the cert supplied by the server matches the hostname we supplied. If there is no cert file call load_default_certs() Also opened issue2551351 to look into more SMTP ssmtp tightening. We also should have an option in Roundup to use TLS/SSL (smtps) without using starttls. Note that this code is untested by the test suite due to the need to setup an SMTP server with STARTTLS support. issue2551351 has some notes on this.
author John Rouillard <rouilj@ieee.org>
date Wed, 15 May 2024 00:08:05 -0400
parents 3cd43c34c095
children
line wrap: on
line diff
--- a/roundup/mailer.py	Tue May 14 23:06:38 2024 -0400
+++ b/roundup/mailer.py	Wed May 15 00:08:05 2024 -0400
@@ -6,6 +6,7 @@
 import os
 import smtplib
 import socket
+import ssl
 import sys
 import time
 import traceback
@@ -312,8 +313,18 @@
         # start the TLS if requested
         if config["MAIL_TLS"]:
             self.ehlo()
-            self.starttls(config["MAIL_TLS_KEYFILE"],
-                          config["MAIL_TLS_CERTFILE"])
+            if sys.version_info[0:2] >= (3, 6):
+                sslctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
+                if config["MAIL_TLS_CERTFILE"]:
+                    sslctx.load_cert_chain(config["MAIL_TLS_CERTFILE"],
+                                           keyfile=config["MAIL_TLS_KEYFILE"])
+                    sslctx.check_hostname = True
+                else:
+                    sslctx.load_default_certs()
+                self.starttls(context=sslctx)
+            else:
+                self.starttls(config["MAIL_TLS_KEYFILE"],
+                              config["MAIL_TLS_CERTFILE"])
 
         # ok, now do we also need to log in?
         mailuser = config["MAIL_USERNAME"]

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