[pbs-devel] [PATCH v1 proxmox 0/3] Fix #5105: Overhaul TLS Handshake Checking Logic

[Max Carrara]

On Mon Jul 8, 2024 at 7:49 AM CEST, Max Carrara wrote:
> Fix #5105: Overhaul TLS Handshake Checking Logic
> ================================================

Superseded by: https://lists.proxmox.com/pipermail/pbs-devel/2024-July/010097.html

>
> This series fixes bug #5105 [1] by overhauling the TLS handshake
> checking logic, which is performed when using a connection acceptor
> variant with optional TLS.
>
> In the case of PBS (the only place where this is used, to my knowledge),
> any requests made over plain HTTP are redirected to the same host, but
> clients are instructed to use HTTPS instead.
>
> The TLS handshake checking logic determines whether the client uses HTTP
> or HTTPS by peeking into the stream buffer -- if the first 5 received
> bytes look like a TLS handshake fragment, the connection is passed on to
> OpenSSL before being accepted. Otherwise the connection is assumed to be
> unencrypted, i.e. plain HTTP.
>
> However, this logic contains two errors:
>
>   1. The timeout duration is too short - one second is too little
>   2. When a timeout occurs, the connection is assumed to be unencrypted
>      (and thus plain HTTP)
>
> The patches 01 and 02 are mainly done in preparation for patch 03 (which
> contains the actual fix), improving the overall quality of the code and
> including the peer's address in error logs.
>
> Please see the individual patches for more information.
>
> Special thanks go to Stefan Hanreich whose advice helped identifying
> many individual puzzle pieces comprising this issue.
>
> References
> ----------
>
> [1]: https://bugzilla.proxmox.com/show_bug.cgi?id=5105
>
> Summary of Changes
> ------------------
>
> Max Carrara (3):
>   rest-server: connection: clean up accept data flow
>   rest-server: connection: log peer address on error
>   fix #5105: rest-server: connection: overhaul TLS handshake check logic
>
>  proxmox-rest-server/src/connection.rs | 165 +++++++++++++-------------
>  1 file changed, 85 insertions(+), 80 deletions(-)