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fix(postgres): harden managed-session statement policy - #275
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…REGATE An aggregate whose SFUNC is pg_catalog.set_config invokes set_config under an attacker-chosen name, bypassing the FuncCall-based classifier and letting a client reset the managed role or a pinned setting.
mslipper
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Oct 6, 2026
* fix(postgres): reject callback-binding definitions such as CREATE AGGREGATE * test(postgres): cover aggregate alias and harden fixture grants * test(postgres): keep fixture privileges default so tests exercise the proxy
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Tightens the statement policy the Postgres proxy applies to managed sessions. The proxy now rejects a broader class of definition statements that register functions to be invoked implicitly later. This narrows what clients can define on a session whose role and settings the proxy manages.
Also updates the integration fixture and README with database-side privilege hardening recommended for the injected role.