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Michael Paquier af298f00a1 Fix detection of passwords hashed with MD5 
This commit fixes an issue related to the way password verifiers hashed
with MD5 are detected, leading to possibly detect that plain passwords
are legit MD5 hashes.  A MD5-hashed entry was checked based on if its
header uses "md5" and if the string length matches what is expected.
Unfortunately the code never checked if the hash only used hexadecimal
characters after the three-character prefix.

Fix 9.6 down to 9.4, where this code is present.  This area of the code
has changed in 10 and upwards with the introduction of SCRAM, which led
to a different fix committed as of ccae190.

Reported-by: Tom Lane
Author: Michael Paquier
Reviewed-by: Jonathan Katz
Discussion: https://postgr.es/m/016deb6b-1f0a-8e9f-1833-a8675b170aa9@postgresql.org
Backpatch-through: 9.4
2019-04-24 09:05:25 +09:00
config Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
contrib Avoid double-free in vacuumlo error path. 2019-03-24 15:13:21 -04:00
doc Fix documentation of pg_start_backup and pg_stop_backup functions. 2019-04-23 02:44:25 +09:00
src Fix detection of passwords hashed with MD5 2019-04-24 09:05:25 +09:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Fix whitespace and remove obsolete gitattributes entry 2016-03-13 16:03:13 -04:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Stamp 9.6.12. 2019-02-11 16:21:19 -05:00
configure.in Stamp 9.6.12. 2019-02-11 16:21:19 -05:00
COPYRIGHT Update copyright for 2019 2019-01-02 12:44:25 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -04:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:31 -08:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

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:

	https://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
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.