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Instead, send the same FATAL message as with other password-based authentication mechanisms. This gives a more user-friendly message: psql: FATAL: password authentication failed for user "test" instead of: psql: error received from server in SASL exchange: invalid-proof Even before this patch, the server sent that FATAL message, after the SCRAM-specific "e=invalid-proof" message. But libpq would stop at the SCRAM error message, and not process the ErrorResponse that would come after that. We could've taught libpq to check for an ErrorResponse after failed authentication, but it's simpler to modify the server to send only the ErrorResponse. The SCRAM specification allows for aborting the authentication at any point, using an application-defined error mechanism, like PostgreSQL's ErrorResponse. Using the e=invalid-proof message is optional. Reported by Jeff Janes. Discussion: https://www.postgresql.org/message-id/CAMkU%3D1w3jQ53M1OeNfN8Cxd9O%2BA_9VONJivTbYoYRRdRsLT6vA@mail.gmail.com
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/.