oauth: Disallow OAuth connections via postgres_fdw/dblink

A subsequent commit will reclassify oauth_client_secret from dispchar=""
to dispchar="*", so that UIs will treat it like a secret. For our FDWs,
this change will move that option from SERVER to USER MAPPING, which we
need to avoid.

But upon further discussion, we don't really want our FDWs to use our
builtin Device Authorization flow at all, for several reasons:

- the URL and code would be printed to the server logs, not sent over
  the client connection
- tokens are not cached/refreshed, so every single connection has to be
  manually authorized by a user with a browser
- oauth_client_secret needs to belong to the foreign server, but options
  on SERVER are publicly accessible
- all non-superusers would need password_required=false, which is
  dangerous

Future OAuth work can use FDWs as a motivating use case. But for now,
disallow all oauth_* connection options for these two extensions.

Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/20250415191435.55.nmisch%40google.com

1 files changed, 8 insertions, 0 deletions

diff --git a/contrib/postgres_fdw/sql/postgres_fdw.sql b/contrib/postgres_fdw/sql/postgres_fdw.sql
index ea6287b03fd..1f27260bafe 100644
--- a/contrib/postgres_fdw/sql/postgres_fdw.sql
+++ b/contrib/postgres_fdw/sql/postgres_fdw.sql
@@ -213,6 +213,14 @@ ALTER USER MAPPING FOR public SERVER testserver1
 ALTER USER MAPPING FOR public SERVER testserver1
 	OPTIONS (ADD sslkey 'value', ADD sslcert 'value');
 
+-- OAuth options are not allowed in either context
+ALTER SERVER testserver1 OPTIONS (ADD oauth_issuer 'https://example.com');
+ALTER SERVER testserver1 OPTIONS (ADD oauth_client_id 'myID');
+ALTER USER MAPPING FOR public SERVER testserver1
+	OPTIONS (ADD oauth_issuer 'https://example.com');
+ALTER USER MAPPING FOR public SERVER testserver1
+	OPTIONS (ADD oauth_client_id 'myID');
+
 ALTER FOREIGN TABLE ft1 OPTIONS (schema_name 'S 1', table_name 'T 1');
 ALTER FOREIGN TABLE ft2 OPTIONS (schema_name 'S 1', table_name 'T 1');
 ALTER FOREIGN TABLE ft1 ALTER COLUMN c1 OPTIONS (column_name 'C 1');