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MD5 has been considered to be unsuitable for use as a cryptographic hash algorithm for some time. Furthermore, MD5 password hashes in PostgreSQL are vulnerable to pass-the-hash attacks, i.e., knowing the username and hashed password is sufficient to authenticate. The SCRAM-SHA-256 method added in v10 is not subject to these problems and is considered to be superior to MD5. This commit marks MD5 password support in PostgreSQL as deprecated and to be removed in a future release. The documentation now contains several deprecation notices, and CREATE ROLE and ALTER ROLE now emit deprecation warnings when setting MD5 passwords. The warnings can be disabled by setting the md5_password_warnings parameter to "off". Reviewed-by: Greg Sabino Mullane, Jim Nasby Discussion: https://postgr.es/m/ZwbfpJJol7lDWajL%40nathan |
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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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.