05a295441c
In QUIC, a STREAM frame may be received with no data but with FIN bit set. This situation is tedious to handle and haproxy parsing code has changed several times to deal with this situation. Now, H3 and H09 layers parsing code are skipped in favor of the shared function qcs_http_handle_standalone_fin() used to handle the HTX EOM emission. However, this shortcut bypasses an important HTTP/3 validation check on the received body size vs the announced content-length header. Under some conditions, this could cause a desynchronization with the backend server which could be exploited for request smuggling. Fix HTTP/3 parsing code by adding a call to h3_check_body_size() prior to qcs_http_handle_standalone_fin() if content-length header has been found. If the body size is incorrect, the stream is immediately resetted with H3_MESSAGE_ERROR code and the error is forwarded to the stream layer. Thanks to Martino Spagnuolo for his detailed report on this issue and for having contacting us about it via the security mailing list. This must be backported up to 2.6.
HAProxy
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:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
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.