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The 16-bit name_len field is read directly from the ClientHello and stored as the sample length without any validation against srv_len, ext_len, or the channel buffer size. A 65-byte ClientHello with name_len=0xffff produces a sample claiming 65535 bytes of data when only ~4 bytes are actually present in the buffer. Downstream consumers then read tens of kilobytes past the channel buffer: - pattern.c:741 XXH3() hashes 65535 bytes -> ~50KB OOB heap read - sample.c smp_dup memcpy if large trash configured - log-format %[req.ssl_sni] leaks heap contents to logs/headers Reachable pre-authentication on any TCP frontend using req.ssl_sni (req_ssl_sni), which is the documented way to do SNI-based content switching in TCP mode. No SSL handshake is required; the parser runs on raw buffer contents in tcp-request content rules. Bug introduced in commit d4c33c8889ec3 (2013). The ALPN parser in the same file at line 1044 has the equivalent check; SNI never did. This must be backported to all supported versions.
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.