Frederic Lecaille 878a72d001 BUG/MEDIUM: quic: listener connection stuck during handshakes (OpenSSL 3.5)
This issue was reported in GH #3071 by @famfo where a wireshark capture
reveals that some handshake could not complete after having received
two Initial packets. This could happen when the packets were parsed
in two times, calling qc_ssl_provide_all_quic_data() two times.

This is due to crypto data stream counter which was incremented two times
from qc_ssl_provide_all_quic_data() (see cstream->rx.offset += data
statement around line 1223 in quic_ssl.c). One time by the callback
which "receives" the crypto data, and on time by qc_ssl_provide_all_quic_data().

Then when parsing the second crypto data frame, the parser detected
that the crypto were already provided.

To fix this, one could comment the code which increment the crypto data
stream counter by <data>. That said, when using the OpenSSL 3.5 QUIC API
one should not modified the crypto data stream outside of the OpenSSL 3.5
QUIC API.

So, this patch stop calling qc_ssl_provide_all_quic_data() and
qc_ssl_provide_quic_data() and only calls qc_ssl_do_hanshake() after
having received some crypto data. In addition to this, as these functions
are no more called when building haproxy against OpenSSL 3.5, this patch
disable their compilations (with #ifndef HAVE_OPENSSL_QUIC).

This patch depends on this previous one:

     MINOR: quic: implement qc_ssl_do_hanshake()

Thank you to @famto for this report.

Must be backported to 3.2.
2025-08-14 14:54:47 +02:00
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HAProxy

alpine/musl AWS-LC openssl no-deprecated Illumos NetBSD FreeBSD VTest

HAProxy logo

HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

Installation

The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.

Getting help

The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.

The issue tracker is only for bug reports or feature requests.

Documentation

The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.

Please refer to the following files depending on what you're looking for:

  • INSTALL for instructions on how to build and install HAProxy
  • BRANCHES to understand the project's life cycle and what version to use
  • LICENSE for the project's license
  • CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory:

License

HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.

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