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Prevent privilege escalation in explicit calls to PL validators.

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The primary role of PL validators is to be called implicitly during
CREATE FUNCTION, but they are also normal functions that a user can call
explicitly.  Add a permissions check to each validator to ensure that a
user cannot use explicit validator calls to achieve things he could not
otherwise achieve.  Back-patch to 8.4 (all supported versions).
Non-core procedural language extensions ought to make the same two-line
change to their own validators.

Andres Freund, reviewed by Tom Lane and Noah Misch.

Security: CVE-2014-0061
This commit is contained in:
Noah Misch
2014-02-17 09:33:31 -05:00
parent 15a8f97b9d
commit 1d701d28a7
8 changed files with 109 additions and 2 deletions
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4
src/pl/plpython/plpy_main.c
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@@ -159,6 +159,9 @@ plpython_validator(PG_FUNCTION_ARGS)
Form_pg_proc procStruct;
bool is_trigger;
if (!CheckFunctionValidatorAccess(fcinfo->flinfo->fn_oid, funcoid))
PG_RETURN_VOID();
if (!check_function_bodies)
{
PG_RETURN_VOID();
@@ -184,6 +187,7 @@ plpython_validator(PG_FUNCTION_ARGS)
Datum
plpython2_validator(PG_FUNCTION_ARGS)
{
/* call plpython validator with our fcinfo so it gets our oid */
return plpython_validator(fcinfo);
}
#endif /* PY_MAJOR_VERSION < 3 */