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Michael Paquier 5513dc6a30 Improve error handling of HMAC computations 
This is similar to b69aba7, except that this completes the work for
HMAC with a new routine called pg_hmac_error() that would provide more
context about the type of error that happened during a HMAC computation:
- The fallback HMAC implementation in hmac.c relies on cryptohashes, so
in some code paths it is necessary to return back the error generated by
cryptohashes.
- For the OpenSSL implementation (hmac_openssl.c), the logic is very
similar to cryptohash_openssl.c, where the error context comes from
OpenSSL if one of its internal routines failed, with different error
codes if something internal to hmac_openssl.c failed or was incorrect.

Any in-core code paths that use the centralized HMAC interface are
related to SCRAM, for errors that are unlikely going to happen, with
only SHA-256.  It would be possible to see errors when computing some
HMACs with MD5 for example and OpenSSL FIPS enabled, and this commit
would help in reporting the correct errors but nothing in core uses
that.  So, at the end, no backpatch to v14 is done, at least for now.

Errors in SCRAM related to the computation of the server key, stored
key, etc. need to pass down the potential error context string across
more layers of their respective call stacks for the frontend and the
backend, so each surrounding routine is adapted for this purpose.

Reviewed-by: Sergey Shinderuk
Discussion: https://postgr.es/m/Yd0N9tSAIIkFd+qi@paquier.xyz
 		2022-01-13 16:17:21 +09:00
config Pacify perlcritic. 2021-11-22 15:57:31 -05:00
contrib Include permissive/enforcing state in sepgsql log messages. 2022-01-12 14:23:13 -05:00
doc doc: Add "(process)" to the term "WAL receiver" in glossary. 2022-01-13 12:17:33 +09:00
src Improve error handling of HMAC computations 2022-01-13 16:17:21 +09:00
.cirrus.yml ci: Add continuous integration for github repositories via cirrus-ci. 2021-12-30 19:02:44 -08:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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COPYRIGHT Update copyright for 2022 2022-01-07 19:04:57 -05:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
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aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Make EXEC_BACKEND more convenient on Linux and FreeBSD. 2022-01-11 00:04:33 +13:00
configure.ac Make EXEC_BACKEND more convenient on Linux and FreeBSD. 2022-01-11 00:04:33 +13:00

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/.