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Michael Paquier 8fea86830e Add support for regexps on database and user entries in pg_hba.conf 
As of this commit, any database or user entry beginning with a slash (/)
is considered as a regular expression.  This is particularly useful for
users, as now there is no clean way to match pattern on multiple HBA
lines.  For example, a user name mapping with a regular expression needs
first to match with a HBA line, and we would skip the follow-up HBA
entries if the ident regexp does *not* match with what has matched in
the HBA line.

pg_hba.conf is able to handle multiple databases and roles with a
comma-separated list of these, hence individual regular expressions that
include commas need to be double-quoted.

At authentication time, user and database names are now checked in the
following order:
- Arbitrary keywords (like "all", the ones beginning by '+' for
membership check), that we know will never have a regexp.  A fancy case
is for physical WAL senders, we *have* to only match "replication" for
the database.
- Regular expression matching.
- Exact match.
The previous logic did the same, but without the regexp step.

We have discussed as well the possibility to support regexp pattern
matching for host names, but these happen to lead to tricky issues based
on what I understand, particularly with host entries that have CIDRs.

This commit relies heavily on the refactoring done in a903971 and
fc579e1, so as the amount of code required to compile and execute
regular expressions is now minimal.  When parsing pg_hba.conf, all the
computed regexps needs to explicitely free()'d, same as pg_ident.conf.

Documentation and TAP tests are added to cover this feature, including
cases where the regexps use commas (for clarity in the docs, coverage
for the parsing logic in the tests).

Note that this introduces a breakage with older versions, where a
database or user name beginning with a slash are treated as something to
check for an equal match.  Per discussion, we have discarded this as
being much of an issue in practice as it would require a cluster to
have database and/or role names that begin with a slash, as well as HBA
entries using these.  Hence, the consistency gained with regexps in
pg_ident.conf is more appealing in the long term.

**This compatibility change should be mentioned in the release notes.**

Author: Bertrand Drouvot
Reviewed-by: Jacob Champion, Tom Lane, Michael Paquier
Discussion: https://postgr.es/m/fff0d7c1-8ad4-76a1-9db3-0ab6ec338bf7@amazon.com
2022-10-24 11:45:31 +09:00
config meson: Add initial version of meson based build system 2022-09-21 22:37:17 -07:00
contrib Fix assertion failures while processing NEW_CID record in logical decoding. 2022-10-20 08:49:48 +05:30
doc Add support for regexps on database and user entries in pg_hba.conf 2022-10-24 11:45:31 +09:00
src Add support for regexps on database and user entries in pg_hba.conf 2022-10-24 11:45:31 +09:00
.cirrus.yml meson: Add support for building with precompiled headers 2022-10-06 17:19:30 -07:00
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README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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/.