336170007c
For a long time we've been observing some sporadic leaks of ssl-capture pool entries on haproxy.org without figuring exactly the root cause. All that was seen was that less calls to the free callback were made than calls to the hello parsing callback, and these were never reproduced locally. It recently turned out to be triggered by the presence of "curves" or "ecdhe" on the "bind" line. Captures have shown the presence of a second client hello, called "Change Cipher Client Hello" in wireshark traces, that calls the client hello callback again. That one wasn't prepared for being called twice per connection, so it allocates an ssl-capture entry and assigns it to the ex_data entry, possibly overwriting the previous one. In this case, the fix is super simple, just reuse the current ex_data if it exists, otherwise allocate a new one. This completely solves the problem. Other callbacks have been audited for the same issue and are not affected: ssl_ini_keylog() already performs this check and ignores subsequent calls, and other ones do not allocate data. 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.