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Use @extschema:name@ notation in contrib transform modules.

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Harden hstore_plperl, hstore_plpython, and ltree_plpython
against search-path-based attacks by using @extschema:name@
notation to refer to the underlying hstore or ltree data type.

This allows removal of the previous documentation warning
suggesting that they must be installed in the same schema as
the underlying data type.  In passing, also improve a para in
extend.sgml to suggest using @extschema:name@ for such purposes.

Discussion: https://postgr.es/m/692480.1736021695@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2025-01-09 15:16:56 -05:00
parent ebd8fc7e47
commit bebe904038
7 changed files with 13 additions and 35 deletions
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6
contrib/hstore_plpython/hstore_plpython3u--1.0.sql
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@ -7,13 +7,13 @@ CREATE FUNCTION hstore_to_plpython3(val internal) RETURNS internal
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME', 'hstore_to_plpython';
CREATE FUNCTION plpython3_to_hstore(val internal) RETURNS hstore
CREATE FUNCTION plpython3_to_hstore(val internal) RETURNS @extschema:hstore@.hstore
LANGUAGE C STRICT IMMUTABLE
AS 'MODULE_PATHNAME', 'plpython_to_hstore';
CREATE TRANSFORM FOR hstore LANGUAGE plpython3u (
CREATE TRANSFORM FOR @extschema:hstore@.hstore LANGUAGE plpython3u (
FROM SQL WITH FUNCTION hstore_to_plpython3(internal),
TO SQL WITH FUNCTION plpython3_to_hstore(internal)
);
COMMENT ON TRANSFORM FOR hstore LANGUAGE plpython3u IS 'transform between hstore and Python dict';
COMMENT ON TRANSFORM FOR @extschema:hstore@.hstore LANGUAGE plpython3u IS 'transform between hstore and Python dict';