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From: Chuck Lever <chuck.lever@oracle.com>
To: netdev@vger.kernel.org, linux-nfs@vger.kernel.org,
	linux-nvme@lists.infradead.org, linux-cifs@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Cc: ak@tempesta-tech.com, borisp@nvidia.com, simo@redhat.com
Subject: [PATCH RFC 0/5] Implement a TLS handshake upcall
Date: Mon, 18 Apr 2022 12:49:22 -0400	[thread overview]
Message-ID: <165030051838.5073.8699008789153780301.stgit@oracle-102.nfsv4.dev> (raw)

There are a few upper-layer (storage) protocols that want to have a
full TLS implementation available in the Linux kernel.

The Linux kernel currently has an implementation of the TLS record
protocol, known as kTLS. However it does not have a complete TLS
implementation because it has no implementation of the TLS handshake
protocol. In-kernel storage protocols need both to use TLS properly.

In the long run, our preference is to have a TLS handshake
implementation in the kernel. However, it appears that would take a
long time and there is some desire to avoid adding to the Linux
kernel's "attack surface" without good reasons. So in the meantime
we've created a prototype handshake implementation that calls out to
user space where the actual handshake can be done by an existing
library implementation of TLS.

The prototype serves several purposes, including:

- Proof of concept: can a handshake upcall actually be implemented?

- Scaffold to enable prototyping upper-layer protocol support for TLS:
  Is there any demand for in-kernel TLS?

- Performance impact of always-on encryption with both software and
  hardware kTLS

- Understanding what features, if any, an upcall handshake cannot
  provide

The prototype currently supports client-side PSK and anonymous
x.509 ClientHello. We would like some feedback on the approach
before proceeding with ServerHello and mutual x.509 authentication.


User agent: https://github.com/oracle/ktls-utils

Who will use this implementation?
--------------------------------

This series implements only the upcall. I plan to post a second
series that shows how it can be used to implement the RPC-with-TlS
standard: https://datatracker.ietf.org/doc/draft-ietf-nfsv4-rpc-tls/

https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git topic-rpc-with-tls

Dr. Hannes Reinecke has a series that implements NVMe-TLS here:

https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git tls-upcall.v4

We are also working with a few developers in the CIFS community
who are interested in SMB-over-QUIC. QUICv1 (RFC 9000) uses the
TLSv1.3 handshake protocol, and we hope they can leverage this
prototype capability when QUIC comes to the Linux kernel.

---

Chuck Lever (4):
      net: Add distinct sk_psock field
      net/tls: Add an AF_TLSH address family
      net/tls: Add support for PF_TLSH (a TLS handshake listener)
      net/tls: Add observability for AF_TLSH sockets

Hannes Reinecke (1):
      tls: build proto after context has been initialized


 .../networking/tls-in-kernel-handshake.rst    |  103 ++
 include/linux/skmsg.h                         |    2 +-
 include/linux/socket.h                        |    5 +-
 include/net/sock.h                            |    7 +-
 include/net/tls.h                             |   15 +
 include/net/tlsh.h                            |   22 +
 include/uapi/linux/tls.h                      |   16 +
 net/core/skmsg.c                              |    6 +-
 net/core/sock.c                               |    4 +-
 net/socket.c                                  |    1 +
 net/tls/Makefile                              |    2 +-
 net/tls/af_tlsh.c                             | 1078 +++++++++++++++++
 net/tls/tls_main.c                            |   13 +-
 net/tls/trace.c                               |    3 +
 net/tls/trace.h                               |  355 ++++++
 security/selinux/hooks.c                      |    4 +-
 security/selinux/include/classmap.h           |    4 +-
 .../perf/trace/beauty/include/linux/socket.h  |    4 +-
 18 files changed, 1631 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/networking/tls-in-kernel-handshake.rst
 create mode 100644 include/net/tlsh.h
 create mode 100644 net/tls/af_tlsh.c

--
Chuck Lever


             reply	other threads:[~2022-04-18 16:49 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-18 16:49 Chuck Lever [this message]
2022-04-18 16:49 ` [PATCH RFC 1/5] net: Add distinct sk_psock field Chuck Lever
2022-04-21  7:35   ` Hannes Reinecke
2022-07-13  4:46     ` Hawkins Jiawei
2022-07-13  4:46       ` Hawkins Jiawei
2022-04-18 16:49 ` [PATCH RFC 2/5] tls: build proto after context has been initialized Chuck Lever
2022-04-25 17:11   ` Jakub Kicinski
2022-04-25 17:51     ` Chuck Lever III
2022-05-20 16:39   ` Chuck Lever III
2022-04-18 16:49 ` [PATCH RFC 3/5] net/tls: Add an AF_TLSH address family Chuck Lever
2022-04-21  7:35   ` Hannes Reinecke
2022-04-18 16:49 ` [PATCH RFC 4/5] net/tls: Add support for PF_TLSH (a TLS handshake listener) Chuck Lever
2022-04-21  7:36   ` Hannes Reinecke
2022-04-25 17:14   ` Jakub Kicinski
2022-04-26  9:43     ` Hannes Reinecke
2022-04-26 14:29       ` Sagi Grimberg
2022-04-26 15:02         ` Jakub Kicinski
2022-04-26 15:58           ` Hannes Reinecke
2022-04-27  0:03             ` Jakub Kicinski
2022-04-27 15:24               ` Chuck Lever III
2022-04-28  7:26               ` Hannes Reinecke
2022-04-28 13:30                 ` Jakub Kicinski
2022-04-28 13:51                   ` Hannes Reinecke
2022-04-28 14:09                     ` Benjamin Coddington
2022-04-28 21:08                       ` Jakub Kicinski
2022-05-24 10:05                         ` [ovs-dev] " Ilya Maximets
2022-04-26 14:55       ` Jakub Kicinski
2022-04-26 13:48     ` Chuck Lever III
2022-04-26 14:55       ` Jakub Kicinski
2022-04-26 15:58         ` Chuck Lever III
2022-04-26 23:47           ` Jakub Kicinski
2022-04-27 14:42             ` Chuck Lever III
2022-04-27 23:53               ` Jakub Kicinski
2022-04-28  1:29                 ` Chuck Lever III
2022-04-28 21:08                   ` Jakub Kicinski
2022-04-28 21:54                     ` Chuck Lever III
2022-04-28  8:49   ` Boris Pismenny
2022-04-28 13:12     ` Simo Sorce
2022-04-29 15:19       ` Chuck Lever III
2022-04-28 15:24     ` Chuck Lever III
2022-04-29  6:25       ` Hannes Reinecke
2022-04-18 16:49 ` [PATCH RFC 5/5] net/tls: Add observability for AF_TLSH sockets Chuck Lever
2022-04-21  7:36   ` Hannes Reinecke

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