postgres

Heikki Linnakangas fe0a0b5993 Replace PostmasterRandom() with a stronger source, second attempt. This adds a new routine, pg_strong_random() for generating random bytes, for use in both frontend and backend. At the moment, it's only used in the backend, but the upcoming SCRAM authentication patches need strong random numbers in libpq as well. pg_strong_random() is based on, and replaces, the existing implementation in pgcrypto. It can acquire strong random numbers from a number of sources, depending on what's available: - OpenSSL RAND_bytes(), if built with OpenSSL - On Windows, the native cryptographic functions are used - /dev/urandom Unlike the current pgcrypto function, the source is chosen by configure. That makes it easier to test different implementations, and ensures that we don't accidentally fall back to a less secure implementation, if the primary source fails. All of those methods are quite reliable, it would be pretty surprising for them to fail, so we'd rather find out by failing hard. If no strong random source is available, we fall back to using erand48(), seeded from current timestamp, like PostmasterRandom() was. That isn't cryptographically secure, but allows us to still work on platforms that don't have any of the above stronger sources. Because it's not very secure, the built-in implementation is only used if explicitly requested with --disable-strong-random. This replaces the more complicated Fortuna algorithm we used to have in pgcrypto, which is unfortunate, but all modern platforms have /dev/urandom, so it doesn't seem worth the maintenance effort to keep that. pgcrypto functions that require strong random numbers will be disabled with --disable-strong-random. Original patch by Magnus Hagander, tons of further work by Michael Paquier and me. Discussion: https://www.postgresql.org/message-id/CAB7nPqRy3krN8quR9XujMVVHYtXJ0_60nqgVc6oUk8ygyVkZsA@mail.gmail.com Discussion: https://www.postgresql.org/message-id/CAB7nPqRWkNYRRPJA7-cF+LfroYV10pvjdz6GNvxk-Eee9FypKA@mail.gmail.com		9 years ago
config	Fix python shlib probe for Cygwin.	9 years ago
contrib	Replace PostmasterRandom() with a stronger source, second attempt.	9 years ago
doc	Replace PostmasterRandom() with a stronger source, second attempt.	9 years ago
src	Replace PostmasterRandom() with a stronger source, second attempt.	9 years ago
.dir-locals.el	emacs: Set indent-tabs-mode in perl-mode	10 years ago
.gitattributes	Fix whitespace and remove obsolete gitattributes entry	9 years ago
.gitignore	Allow .so minor version numbers above 9 in .gitignore.	9 years ago
COPYRIGHT	Update copyright for 2016	10 years ago
GNUmakefile.in	Have "make coverage" recurse into contrib as well	9 years ago
HISTORY	Improve text of stub HISTORY file.	12 years ago
Makefile	Allow make check in PL directories	15 years ago
README	Don't generate plain-text HISTORY and src/test/regress/README anymore.	12 years ago
README.git	Don't generate plain-text HISTORY and src/test/regress/README anymore.	12 years ago
aclocal.m4	Replace our hacked version of ax_pthread.m4 with latest upstream version.	10 years ago
configure	Replace PostmasterRandom() with a stronger source, second attempt.	9 years ago
configure.in	Replace PostmasterRandom() with a stronger source, second attempt.	9 years ago

README

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/.