From b8e28f04f7f339d4285852960e6455de75dbf9b3 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Mon, 8 May 2023 10:12:44 -0400 Subject: [PATCH] Handle RLS dependencies in inlined set-returning functions properly. If an SRF in the FROM clause references a table having row-level security policies, and we inline that SRF into the calling query, we neglected to mark the plan as potentially dependent on which role is executing it. This could lead to later executions in the same session returning or hiding rows that should have been hidden or returned instead. Our thanks to Wolfgang Walther for reporting this problem. Stephen Frost and Tom Lane Security: CVE-2023-2455 --- src/backend/optimizer/util/clauses.c | 7 ++++++ src/test/regress/expected/rowsecurity.out | 27 +++++++++++++++++++++++ src/test/regress/sql/rowsecurity.sql | 20 +++++++++++++++++ 3 files changed, 54 insertions(+) diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index dc908eae43..10843fb380 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -5110,6 +5110,13 @@ inline_set_returning_function(PlannerInfo *root, RangeTblEntry *rte) */ record_plan_function_dependency(root, func_oid); + /* + * We must also notice if the inserted query adds a dependency on the + * calling role due to RLS quals. + */ + if (querytree->hasRowSecurity) + root->glob->dependsOnRole = true; + return querytree; /* Here if func is not inlinable: release temp memory and return NULL */ diff --git a/src/test/regress/expected/rowsecurity.out b/src/test/regress/expected/rowsecurity.out index 8ef52437fc..a844aeb03e 100644 --- a/src/test/regress/expected/rowsecurity.out +++ b/src/test/regress/expected/rowsecurity.out @@ -4038,6 +4038,33 @@ SELECT * FROM rls_tbl; DROP TABLE rls_tbl; RESET SESSION AUTHORIZATION; +-- CVE-2023-2455: inlining an SRF may introduce an RLS dependency +create table rls_t (c text); +insert into rls_t values ('invisible to bob'); +alter table rls_t enable row level security; +grant select on rls_t to regress_rls_alice, regress_rls_bob; +create policy p1 on rls_t for select to regress_rls_alice using (true); +create policy p2 on rls_t for select to regress_rls_bob using (false); +create function rls_f () returns setof rls_t + stable language sql + as $$ select * from rls_t $$; +prepare q as select current_user, * from rls_f(); +set role regress_rls_alice; +execute q; + current_user | c +-------------------+------------------ + regress_rls_alice | invisible to bob +(1 row) + +set role regress_rls_bob; +execute q; + current_user | c +--------------+--- +(0 rows) + +RESET ROLE; +DROP FUNCTION rls_f(); +DROP TABLE rls_t; -- -- Clean up objects -- diff --git a/src/test/regress/sql/rowsecurity.sql b/src/test/regress/sql/rowsecurity.sql index 8845bebe2f..6973cc4ed0 100644 --- a/src/test/regress/sql/rowsecurity.sql +++ b/src/test/regress/sql/rowsecurity.sql @@ -1873,6 +1873,26 @@ SELECT * FROM rls_tbl; DROP TABLE rls_tbl; RESET SESSION AUTHORIZATION; +-- CVE-2023-2455: inlining an SRF may introduce an RLS dependency +create table rls_t (c text); +insert into rls_t values ('invisible to bob'); +alter table rls_t enable row level security; +grant select on rls_t to regress_rls_alice, regress_rls_bob; +create policy p1 on rls_t for select to regress_rls_alice using (true); +create policy p2 on rls_t for select to regress_rls_bob using (false); +create function rls_f () returns setof rls_t + stable language sql + as $$ select * from rls_t $$; +prepare q as select current_user, * from rls_f(); +set role regress_rls_alice; +execute q; +set role regress_rls_bob; +execute q; + +RESET ROLE; +DROP FUNCTION rls_f(); +DROP TABLE rls_t; + -- -- Clean up objects --