5702009c8c
When a new SSL server connection is created, if no SNI is set, it is
possible to inherit from the one of the reused TLS session. The bug was
introduced by the commit 95ac5fe4a ("MEDIUM: ssl_sock: always use the SSL's
server name, not the one from the tid"). The mixup is possible between
regular connections but also with health-checks connections.
But it is only the visible part of the bug. If the SNI of the cached TLS
session does not match the one of the new connection, no reuse must be
performed at all.
To fix the bug, hash of the SNI of the reused session is compared with the
one of the new connection. The TLS session is reused only if the hashes are
the same.
This patch should fix the issue #3195. It must be slowly backported as far
as 3.0. it relies on the following series:
* MEDIUM: tcpcheck/backend: Get the connection SNI before initializing SSL ctx
* MINOR: connection/ssl: Store the SNI hash value in the connection itself
* MEDIUM: ssl: Store hash of the SNI for cached TLS sessions
* MINOR: ssl: Add a function to hash SNIs
* MEDIUM: quic: Add connection as argument when qc_new_conn() is called
* BUG/MINOR: ssl: Don't allow to set NULL sni
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.