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While postgres' use of SSL renegotiation is a good idea in theory, it turned out to not work well in practice. The specification and openssl's implementation of it have lead to several security issues. Postgres' use of renegotiation also had its share of bugs. Additionally OpenSSL has a bunch of bugs around renegotiation, reported and open for years, that regularly lead to connections breaking with obscure error messages. We tried increasingly complex workarounds to get around these bugs, but we didn't find anything complete. Since these connection breakages often lead to hard to debug problems, e.g. spuriously failing base backups and significant latency spikes when synchronous replication is used, we have decided to change the default setting for ssl renegotiation to 0 (disabled) in the released backbranches and remove it entirely in 9.5 and master.. Author: Michael Paquier, with changes by me Discussion: 20150624144148.GQ4797@alap3.anarazel.de Backpatch: 9.0-9.4; 9.5 and master get a different patch |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.