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Again match pg_user_mappings to information_schema.user_mapping_options.
Commit 3eefc51053 claimed to make
pg_user_mappings enforce the qualifications user_mapping_options had
been enforcing, but its removal of a longstanding restriction left them
distinct when the current user is the subject of a mapping yet has no
server privileges. user_mapping_options emits no rows for such a
mapping, but pg_user_mappings includes full umoptions. Change
pg_user_mappings to show null for umoptions. Back-patch to 9.2, like
the above commit.
Reviewed by Tom Lane. Reported by Jeff Janes.
Security: CVE-2017-7547
This commit is contained in:
Noah Misch
@ -8768,17 +8768,37 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
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<entry><type>text[]</type></entry>
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<entry></entry>
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<entry>
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User mapping specific options, as <quote>keyword=value</>
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strings. This column will show as null unless the current user
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is the user being mapped, or the mapping is for
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<literal>PUBLIC</literal> and the current user is the server
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owner, or the current user is a superuser. The intent is
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to protect password information stored as user mapping option.
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User mapping specific options, as <quote>keyword=value</> strings
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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To protect password information stored as a user mapping option,
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the <structfield>umoptions</structfield> column will read as null
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unless one of the following applies:
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<itemizedlist>
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<listitem>
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<para>
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current user is the user being mapped, and owns the server or
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holds <literal>USAGE</> privilege on it
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</para>
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</listitem>
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<listitem>
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<para>
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current user is the server owner and mapping is for <literal>PUBLIC</>
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</para>
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</listitem>
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<listitem>
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<para>
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current user is a superuser
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</para>
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</listitem>
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</itemizedlist>
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</para>
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</sect1>
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@ -669,7 +669,9 @@ CREATE VIEW pg_user_mappings AS
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ELSE
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A.rolname
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END AS usename,
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CASE WHEN (U.umuser <> 0 AND A.rolname = current_user)
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CASE WHEN (U.umuser <> 0 AND A.rolname = current_user
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AND (pg_has_role(S.srvowner, 'USAGE')
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OR has_server_privilege(S.oid, 'USAGE')))
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OR (U.umuser = 0 AND pg_has_role(S.srvowner, 'USAGE'))
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OR (SELECT rolsuper FROM pg_authid WHERE rolname = current_user)
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THEN U.umoptions
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@ -1144,10 +1144,11 @@ ERROR: permission denied for foreign-data wrapper foo
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ALTER SERVER s9 VERSION '1.1';
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GRANT USAGE ON FOREIGN SERVER s9 TO regress_test_role;
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CREATE USER MAPPING FOR current_user SERVER s9;
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-- We use terse mode to avoid ordering issues in cascade detail output.
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\set VERBOSITY terse
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DROP SERVER s9 CASCADE;
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NOTICE: drop cascades to 2 other objects
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DETAIL: drop cascades to user mapping for public on server s9
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drop cascades to user mapping for unprivileged_role on server s9
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\set VERBOSITY default
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RESET ROLE;
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CREATE SERVER s9 FOREIGN DATA WRAPPER foo;
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GRANT USAGE ON FOREIGN SERVER s9 TO unprivileged_role;
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@ -1163,13 +1164,14 @@ ERROR: must be owner of foreign server s9
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SET ROLE regress_test_role;
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CREATE SERVER s10 FOREIGN DATA WRAPPER foo;
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CREATE USER MAPPING FOR public SERVER s10 OPTIONS (user 'secret');
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GRANT USAGE ON FOREIGN SERVER s10 TO unprivileged_role;
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-- owner of server can see option fields
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CREATE USER MAPPING FOR unprivileged_role SERVER s10 OPTIONS (user 'secret');
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-- owner of server can see some option fields
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\deu+
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List of user mappings
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Server | User name | FDW Options
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--------+-------------------+-------------------
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s10 | public | ("user" 'secret')
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s10 | unprivileged_role |
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s4 | foreign_data_user |
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s5 | regress_test_role | (modified '1')
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s6 | regress_test_role |
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@ -1177,15 +1179,16 @@ GRANT USAGE ON FOREIGN SERVER s10 TO unprivileged_role;
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s8 | public |
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s9 | unprivileged_role |
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t1 | public | (modified '1')
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(8 rows)
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(9 rows)
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RESET ROLE;
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-- superuser can see option fields
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-- superuser can see all option fields
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\deu+
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List of user mappings
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Server | User name | FDW Options
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--------+-------------------+---------------------
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s10 | public | ("user" 'secret')
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s10 | unprivileged_role | ("user" 'secret')
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s4 | foreign_data_user |
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s5 | regress_test_role | (modified '1')
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s6 | regress_test_role |
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@ -1193,15 +1196,16 @@ RESET ROLE;
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s8 | public |
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s9 | unprivileged_role |
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t1 | public | (modified '1')
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(8 rows)
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(9 rows)
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-- unprivileged user cannot see option fields
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-- unprivileged user cannot see any option field
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SET ROLE unprivileged_role;
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\deu+
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List of user mappings
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Server | User name | FDW Options
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--------+-------------------+-------------
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s10 | public |
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s10 | unprivileged_role |
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s4 | foreign_data_user |
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s5 | regress_test_role |
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s6 | regress_test_role |
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@ -1209,11 +1213,13 @@ SET ROLE unprivileged_role;
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s8 | public |
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s9 | unprivileged_role |
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t1 | public |
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(8 rows)
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(9 rows)
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RESET ROLE;
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\set VERBOSITY terse
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DROP SERVER s10 CASCADE;
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NOTICE: drop cascades to user mapping for public on server s10
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NOTICE: drop cascades to 2 other objects
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\set VERBOSITY default
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-- DROP FOREIGN TABLE
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DROP FOREIGN TABLE no_table; -- ERROR
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ERROR: foreign table "no_table" does not exist
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@ -1238,16 +1244,12 @@ owner of user mapping for regress_test_role on server s6
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DROP SERVER t1 CASCADE;
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NOTICE: drop cascades to user mapping for public on server t1
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DROP USER MAPPING FOR regress_test_role SERVER s6;
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-- This test causes some order dependent cascade detail output,
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-- so switch to terse mode for it.
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\set VERBOSITY terse
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DROP FOREIGN DATA WRAPPER foo CASCADE;
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NOTICE: drop cascades to 5 other objects
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\set VERBOSITY default
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DROP SERVER s8 CASCADE;
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NOTICE: drop cascades to 2 other objects
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DETAIL: drop cascades to user mapping for foreign_data_user on server s8
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drop cascades to user mapping for public on server s8
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\set VERBOSITY default
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DROP ROLE regress_test_indirect;
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DROP ROLE regress_test_role;
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DROP ROLE unprivileged_role; -- ERROR
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@ -1322,7 +1322,7 @@ SELECT viewname, definition FROM pg_views WHERE schemaname <> 'information_schem
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pg_timezone_abbrevs | SELECT pg_timezone_abbrevs.abbrev, pg_timezone_abbrevs.utc_offset, pg_timezone_abbrevs.is_dst FROM pg_timezone_abbrevs() pg_timezone_abbrevs(abbrev, utc_offset, is_dst);
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pg_timezone_names | SELECT pg_timezone_names.name, pg_timezone_names.abbrev, pg_timezone_names.utc_offset, pg_timezone_names.is_dst FROM pg_timezone_names() pg_timezone_names(name, abbrev, utc_offset, is_dst);
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pg_user | SELECT pg_shadow.usename, pg_shadow.usesysid, pg_shadow.usecreatedb, pg_shadow.usesuper, pg_shadow.usecatupd, pg_shadow.userepl, '********'::text AS passwd, pg_shadow.valuntil, pg_shadow.useconfig FROM pg_shadow;
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pg_user_mappings | SELECT u.oid AS umid, s.oid AS srvid, s.srvname, u.umuser, CASE WHEN (u.umuser = (0)::oid) THEN 'public'::name ELSE a.rolname END AS usename, CASE WHEN ((((u.umuser <> (0)::oid) AND (a.rolname = "current_user"())) OR ((u.umuser = (0)::oid) AND pg_has_role(s.srvowner, 'USAGE'::text))) OR (SELECT pg_authid.rolsuper FROM pg_authid WHERE (pg_authid.rolname = "current_user"()))) THEN u.umoptions ELSE NULL::text[] END AS umoptions FROM ((pg_user_mapping u LEFT JOIN pg_authid a ON ((a.oid = u.umuser))) JOIN pg_foreign_server s ON ((u.umserver = s.oid)));
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pg_user_mappings | SELECT u.oid AS umid, s.oid AS srvid, s.srvname, u.umuser, CASE WHEN (u.umuser = (0)::oid) THEN 'public'::name ELSE a.rolname END AS usename, CASE WHEN (((((u.umuser <> (0)::oid) AND (a.rolname = "current_user"())) AND (pg_has_role(s.srvowner, 'USAGE'::text) OR has_server_privilege(s.oid, 'USAGE'::text))) OR ((u.umuser = (0)::oid) AND pg_has_role(s.srvowner, 'USAGE'::text))) OR (SELECT pg_authid.rolsuper FROM pg_authid WHERE (pg_authid.rolname = "current_user"()))) THEN u.umoptions ELSE NULL::text[] END AS umoptions FROM ((pg_user_mapping u LEFT JOIN pg_authid a ON ((a.oid = u.umuser))) JOIN pg_foreign_server s ON ((u.umserver = s.oid)));
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pg_views | SELECT n.nspname AS schemaname, c.relname AS viewname, pg_get_userbyid(c.relowner) AS viewowner, pg_get_viewdef(c.oid) AS definition FROM (pg_class c LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE (c.relkind = 'v'::"char");
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rtest_v1 | SELECT rtest_t1.a, rtest_t1.b FROM rtest_t1;
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rtest_vcomp | SELECT x.part, (x.size * y.factor) AS size_in_cm FROM rtest_comp x, rtest_unitfact y WHERE (x.unit = y.unit);
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@ -460,7 +460,10 @@ CREATE SERVER s10 FOREIGN DATA WRAPPER foo; -- ERROR
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ALTER SERVER s9 VERSION '1.1';
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GRANT USAGE ON FOREIGN SERVER s9 TO regress_test_role;
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CREATE USER MAPPING FOR current_user SERVER s9;
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-- We use terse mode to avoid ordering issues in cascade detail output.
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\set VERBOSITY terse
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DROP SERVER s9 CASCADE;
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\set VERBOSITY default
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RESET ROLE;
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CREATE SERVER s9 FOREIGN DATA WRAPPER foo;
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GRANT USAGE ON FOREIGN SERVER s9 TO unprivileged_role;
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@ -474,17 +477,19 @@ DROP SERVER s9 CASCADE; -- ERROR
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SET ROLE regress_test_role;
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CREATE SERVER s10 FOREIGN DATA WRAPPER foo;
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CREATE USER MAPPING FOR public SERVER s10 OPTIONS (user 'secret');
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GRANT USAGE ON FOREIGN SERVER s10 TO unprivileged_role;
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-- owner of server can see option fields
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CREATE USER MAPPING FOR unprivileged_role SERVER s10 OPTIONS (user 'secret');
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-- owner of server can see some option fields
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\deu+
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RESET ROLE;
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-- superuser can see option fields
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-- superuser can see all option fields
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\deu+
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-- unprivileged user cannot see option fields
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-- unprivileged user cannot see any option field
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SET ROLE unprivileged_role;
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\deu+
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RESET ROLE;
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\set VERBOSITY terse
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DROP SERVER s10 CASCADE;
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\set VERBOSITY default
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-- DROP FOREIGN TABLE
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DROP FOREIGN TABLE no_table; -- ERROR
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@ -501,12 +506,10 @@ DROP SCHEMA foreign_schema CASCADE;
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DROP ROLE regress_test_role; -- ERROR
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DROP SERVER t1 CASCADE;
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DROP USER MAPPING FOR regress_test_role SERVER s6;
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-- This test causes some order dependent cascade detail output,
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-- so switch to terse mode for it.
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\set VERBOSITY terse
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DROP FOREIGN DATA WRAPPER foo CASCADE;
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\set VERBOSITY default
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DROP SERVER s8 CASCADE;
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\set VERBOSITY default
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DROP ROLE regress_test_indirect;
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DROP ROLE regress_test_role;
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DROP ROLE unprivileged_role; -- ERROR
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