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postgres_fdw: SCRAM authentication pass-through

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This enables SCRAM authentication for postgres_fdw when connecting to
a foreign server without having to store a plain-text password on user
mapping options.

This is done by saving the SCRAM ClientKey and ServeryKey from the
client authentication and using those instead of the plain-text
password for the server-side SCRAM exchange.  The new foreign-server
or user-mapping option "use_scram_passthrough" enables this.

Co-authored-by: Matheus Alcantara <mths.dev@pm.me>
Co-authored-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://www.postgresql.org/message-id/flat/27b29a35-9b96-46a9-bc1a-914140869dac@gmail.com
This commit is contained in:
Peter Eisentraut
2025-01-15 17:55:18 +01:00
parent b6463ea6ef
commit 761c79508e
14 changed files with 450 additions and 42 deletions
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3
contrib/postgres_fdw/option.c
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@ -279,6 +279,9 @@ InitPgFdwOptions(void)
{"analyze_sampling", ForeignServerRelationId, false},
{"analyze_sampling", ForeignTableRelationId, false},
{"use_scram_passthrough", ForeignServerRelationId, false},
{"use_scram_passthrough", UserMappingRelationId, false},
/*
* sslcert and sslkey are in fact libpq options, but we repeat them
* here to allow them to appear in both foreign server context (when