Re: [PATCH RFC 4/5] net/tls: Add support for PF_TLSH (a TLS handshake listener)

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On 4/18/22 18:49, Chuck Lever wrote:
In-kernel TLS consumers need a way to perform a TLS handshake. In
the absence of a handshake implementation in the kernel itself, a
mechanism to perform the handshake in user space, using an existing
TLS handshake library, is necessary.

I've designed a way to pass a connected kernel socket endpoint to
user space using the traditional listen/accept mechanism. accept(2)
gives us a well-understood way to materialize a socket endpoint as a
normal file descriptor in a specific user space process. Like any
open socket descriptor, the accepted FD can then be passed to a
library such as openSSL to perform a TLS handshake.

This prototype currently handles only initiating client-side TLS
handshakes. Server-side handshakes and key renegotiation are left
to do.

Security Considerations
~~~~~~~~ ~~~~~~~~~~~~~~

This prototype is net-namespace aware.

The kernel has no mechanism to attest that the listening user space
agent is trustworthy.

Currently the prototype does not handle multiple listeners that
overlap -- multiple listeners in the same net namespace that have
overlapping bind addresses.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
  .../networking/tls-in-kernel-handshake.rst         |  103 ++
  include/linux/socket.h                             |    1
  include/net/sock.h                                 |    3
  include/net/tls.h                                  |   15
  include/net/tlsh.h                                 |   22
  include/uapi/linux/tls.h                           |   16
  net/core/sock.c                                    |    2
  net/tls/Makefile                                   |    2
  net/tls/af_tlsh.c                                  | 1040 ++++++++++++++++++++
  net/tls/tls_main.c                                 |   10
  10 files changed, 1213 insertions(+), 1 deletion(-)
  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

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@xxxxxxx			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer



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