0aeae23056
FCGI content_length is a 16-bit field but fcgi_set_record_size() is called with size_t/uint32_t arguments. With tune.bufsize >= 65544 (legal; cfgparse-global.c only enforces <= INT_MAX-16), a single HTX DATA block or accumulated outbuf can exceed 65535 bytes. The implicit conversion to uint16_t silently truncates the length field while b_add(mbuf, outbuf.data) writes the full body. A client posting ~99000 bytes can craft the body so that bytes after the truncated length are parsed by PHP-FPM as fresh FCGI records on the connection: a smuggled BEGIN_REQUEST + PARAMS with arbitrary SCRIPT_FILENAME / PHP_VALUE bypasses all haproxy ACLs. Fix the zero-copy path by refusing it when the block exceeds 65535 bytes (falls through to copy). Fix the copy path by capping outbuf.size to 65535 + header so the data-fill loop naturally stops at the FCGI maximum and emits the rest in a subsequent record. The PARAMS path at line 2084 is similarly affected but harder to trigger (requires combined header+param size > 65535) and is covered by the same outbuf.size cap pattern if applied there. This patch must be backported to all stable 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.