[New-bugs-announce] [issue28085] SSL: Add client and server protocols for SSLContext

[Christian Heimes]

New submission from Christian Heimes:

In ticket #28022 and in thread https://mail.python.org/pipermail/python-dev/2016-September/146366.html I discussed two new protocols for SSLContext: PROTOCOL_TLS_CLIENT and PROTOCOL_TLS_SERVER. A SSLContext with PROTOCOL_TLS_CLIENT can only create connections to a server but cannot wrap server sockets. We can use it to have better defaults (e.g. cert validation and hostname verification for client side) and to make it impossible to confuse a server context with a client context. In the long run I'm planning to deprecate all but PROTOCOL_TLS_CLIENT and PROTOCOL_TLS_SERVER.

---
Finally (and this is the biggest) I like to change how the protocols
work. OpenSSL 1.1.0 has deprecated all version specific protocols. Soon
OpenSSL will only support auto-negotiation (formerly known as
PROTOCOL_SSLv23). My patch #26470 added PROTOCOL_TLS as alias for
PROTOCOL_SSLv23. If the last idea is accepted I will remove PROTOCOL_TLS
again. It hasn't been released yet. Instead I'm going to add
PROTOCOL_TLS_CLIENT and PROTOCOL_TLS_SERVER (see
https://www.openssl.org/docs/manmaster/ssl/SSL_CTX_new.html
TLS_server_method(), TLS_client_method()). PROTOCOL_TLS_CLIENT is like
PROTOCOL_SSLv23 but only supports client-side sockets and
PROTOCOL_TLS_SERVER just server-side sockets. In my experience we can't
have a SSLContext with sensible and secure settings for client and
server at the same time. Hostname checking and cert validation is only
sensible for client-side sockets.
---

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assignee: christian.heimes
components: Extension Modules
messages: 275862
nosy: christian.heimes
priority: normal
severity: normal
stage: patch review
status: open
title: SSL: Add client and server protocols for SSLContext
type: enhancement
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28085>
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