Allow sepgsql labels to depend on object name.

The main change here is to call security_compute_create_name_raw()
rather than security_compute_create_raw().  This ups the minimum
requirement for libselinux from 2.0.99 to 2.1.10, but it looks
like most distributions will have picked that up before 9.3 is out.

KaiGai Kohei

configure

@@ -9710,9 +9710,9 @@ fi
 # for contrib/sepgsql
 if test "$with_selinux" = yes; then
 
-{ $as_echo "$as_me:$LINENO: checking for selinux_status_open in -lselinux" >&5
-$as_echo_n "checking for selinux_status_open in -lselinux... " >&6; }
-if test "${ac_cv_lib_selinux_selinux_status_open+set}" = set; then
+{ $as_echo "$as_me:$LINENO: checking for security_compute_create_name in -lselinux" >&5
+$as_echo_n "checking for security_compute_create_name in -lselinux... " >&6; }
+if test "${ac_cv_lib_selinux_security_compute_create_name+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -9730,11 +9730,11 @@ cat >>conftest.$ac_ext <<_ACEOF
 #ifdef __cplusplus
 extern "C"
 #endif
-char selinux_status_open ();
+char security_compute_create_name ();
 int
 main ()
 {
-return selinux_status_open ();
+return security_compute_create_name ();
   ;
   return 0;
 }
@@ -9760,31 +9760,31 @@ $as_echo "$ac_try_echo") >&5
 	 test "$cross_compiling" = yes ||
 	 $as_test_x conftest$ac_exeext
        }; then
-  ac_cv_lib_selinux_selinux_status_open=yes
+  ac_cv_lib_selinux_security_compute_create_name=yes
 else
   $as_echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-	ac_cv_lib_selinux_selinux_status_open=no
+	ac_cv_lib_selinux_security_compute_create_name=no
 fi
 
 rm -rf conftest.dSYM
 rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
       conftest$ac_exeext conftest.$ac_ext
 LIBS=$ac_check_lib_save_LIBS
 fi
-{ $as_echo "$as_me:$LINENO: result: $ac_cv_lib_selinux_selinux_status_open" >&5
-$as_echo "$ac_cv_lib_selinux_selinux_status_open" >&6; }
-if test "x$ac_cv_lib_selinux_selinux_status_open" = x""yes; then
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_lib_selinux_security_compute_create_name" >&5
+$as_echo "$ac_cv_lib_selinux_security_compute_create_name" >&6; }
+if test "x$ac_cv_lib_selinux_security_compute_create_name" = x""yes; then
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBSELINUX 1
 _ACEOF
 
   LIBS="-lselinux $LIBS"
 
 else
-  { { $as_echo "$as_me:$LINENO: error: library 'libselinux', version 2.0.99 or newer, is required for SELinux support" >&5
-$as_echo "$as_me: error: library 'libselinux', version 2.0.99 or newer, is required for SELinux support" >&2;}
+  { { $as_echo "$as_me:$LINENO: error: library 'libselinux', version 2.1.10 or newer, is required for SELinux support" >&5
+$as_echo "$as_me: error: library 'libselinux', version 2.1.10 or newer, is required for SELinux support" >&2;}
    { (exit 1); exit 1; }; }
 fi
 

configure.in

@@ -952,8 +952,8 @@ fi
 
 # for contrib/sepgsql
 if test "$with_selinux" = yes; then
-  AC_CHECK_LIB(selinux, selinux_status_open, [],
-               [AC_MSG_ERROR([library 'libselinux', version 2.0.99 or newer, is required for SELinux support])])
+  AC_CHECK_LIB(selinux, security_compute_create_name, [],
+               [AC_MSG_ERROR([library 'libselinux', version 2.1.10 or newer, is required for SELinux support])])
 fi
 
 # for contrib/uuid-ossp

contrib/sepgsql/database.c

@@ -92,7 +92,8 @@ sepgsql_database_post_create(Oid databaseId, const char *dtemplate)
 
 	ncontext = sepgsql_compute_create(sepgsql_get_client_label(),
 									  tcontext,
-									  SEPG_CLASS_DB_DATABASE);
+									  SEPG_CLASS_DB_DATABASE,
+									  NameStr(datForm->datname));
 
 	/*
 	 * check db_database:{create} permission

contrib/sepgsql/expected/label.out

@@ -64,17 +64,45 @@ SELECT sepgsql_getcon();	-- confirm client privilege
 
 CREATE TABLE t3 (s int, t text);
 INSERT INTO t3 VALUES (1, 'sss'), (2, 'ttt'), (3, 'uuu');
+SELECT sepgsql_getcon();	-- confirm client privilege
+                   sepgsql_getcon                   
+----------------------------------------------------
+ unconfined_u:unconfined_r:sepgsql_regtest_dba_t:s0
+(1 row)
+
+CREATE TABLE t4 (m int, n text);
+INSERT INTO t4 VALUES (1,'mmm'), (2,'nnn'), (3,'ooo');
 SELECT objtype, objname, label FROM pg_seclabels
-    WHERE provider = 'selinux'
-     AND  objtype in ('table', 'column')
-     AND  objname in ('t1', 't2', 't3');
+    WHERE provider = 'selinux' AND objtype = 'table' AND objname in ('t1', 't2', 't3');
  objtype | objname |                     label                     
 ---------+---------+-----------------------------------------------
  table   | t1      | unconfined_u:object_r:sepgsql_table_t:s0
  table   | t2      | unconfined_u:object_r:sepgsql_table_t:s0
  table   | t3      | unconfined_u:object_r:user_sepgsql_table_t:s0
 (3 rows)
 
+SELECT objtype, objname, label FROM pg_seclabels
+    WHERE provider = 'selinux' AND objtype = 'column' AND (objname like 't3.%' OR objname like 't4.%');
+ objtype |   objname   |                     label                     
+---------+-------------+-----------------------------------------------
+ column  | t3.t        | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.s        | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.ctid     | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.xmin     | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.cmin     | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.xmax     | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.cmax     | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t3.tableoid | unconfined_u:object_r:user_sepgsql_table_t:s0
+ column  | t4.n        | unconfined_u:object_r:sepgsql_table_t:s0
+ column  | t4.m        | unconfined_u:object_r:sepgsql_table_t:s0
+ column  | t4.ctid     | unconfined_u:object_r:sepgsql_sysobj_t:s0
+ column  | t4.xmin     | unconfined_u:object_r:sepgsql_sysobj_t:s0
+ column  | t4.cmin     | unconfined_u:object_r:sepgsql_sysobj_t:s0
+ column  | t4.xmax     | unconfined_u:object_r:sepgsql_sysobj_t:s0
+ column  | t4.cmax     | unconfined_u:object_r:sepgsql_sysobj_t:s0
+ column  | t4.tableoid | unconfined_u:object_r:sepgsql_sysobj_t:s0
+(16 rows)
+
 --
 -- Tests for SECURITY LABEL
 --
@@ -456,6 +484,7 @@ SELECT sepgsql_getcon();	-- confirm client privilege
 DROP TABLE IF EXISTS t1 CASCADE;
 DROP TABLE IF EXISTS t2 CASCADE;
 DROP TABLE IF EXISTS t3 CASCADE;
+DROP TABLE IF EXISTS t4 CASCADE;
 DROP FUNCTION IF EXISTS f1() CASCADE;
 DROP FUNCTION IF EXISTS f2() CASCADE;
 DROP FUNCTION IF EXISTS f3() CASCADE;

contrib/sepgsql/proc.c

@@ -95,7 +95,8 @@ sepgsql_proc_post_create(Oid functionId)
 	tcontext = sepgsql_get_label(NamespaceRelationId,
 								 proForm->pronamespace, 0);
 	ncontext = sepgsql_compute_create(scontext, tcontext,
-									  SEPG_CLASS_DB_PROCEDURE);
+									  SEPG_CLASS_DB_PROCEDURE,
+									  NameStr(proForm->proname));
 
 	/*
 	 * check db_procedure:{create (install)} permission

contrib/sepgsql/relation.c

@@ -88,7 +88,8 @@ sepgsql_attribute_post_create(Oid relOid, AttrNumber attnum)
 	scontext = sepgsql_get_client_label();
 	tcontext = sepgsql_get_label(RelationRelationId, relOid, 0);
 	ncontext = sepgsql_compute_create(scontext, tcontext,
-									  SEPG_CLASS_DB_COLUMN);
+									  SEPG_CLASS_DB_COLUMN,
+									  NameStr(attForm->attname));
 
 	/*
 	 * check db_column:{create} permission
@@ -309,7 +310,8 @@ sepgsql_relation_post_create(Oid relOid)
 	scontext = sepgsql_get_client_label();
 	tcontext = sepgsql_get_label(NamespaceRelationId,
 								 classForm->relnamespace, 0);
-	rcontext = sepgsql_compute_create(scontext, tcontext, tclass);
+	rcontext = sepgsql_compute_create(scontext, tcontext, tclass,
+									  NameStr(classForm->relname));
 
 	/*
 	 * check db_xxx:{create} permission
@@ -363,7 +365,8 @@ sepgsql_relation_post_create(Oid relOid)
 
 			ccontext = sepgsql_compute_create(scontext,
 											  rcontext,
-											  SEPG_CLASS_DB_COLUMN);
+											  SEPG_CLASS_DB_COLUMN,
+											  NameStr(attForm->attname));
 
 			/*
 			 * check db_column:{create} permission

contrib/sepgsql/schema.c

@@ -42,6 +42,7 @@ sepgsql_schema_post_create(Oid namespaceId)
 	char	   *tcontext;
 	char	   *ncontext;
 	char		audit_name[NAMEDATALEN + 20];
+	const char *nsp_name;
 	ObjectAddress object;
 	Form_pg_namespace nspForm;
 
@@ -67,17 +68,21 @@ sepgsql_schema_post_create(Oid namespaceId)
 		elog(ERROR, "catalog lookup failed for namespace %u", namespaceId);
 
 	nspForm = (Form_pg_namespace) GETSTRUCT(tuple);
+	nsp_name = NameStr(nspForm->nspname);
+	if (strncmp(nsp_name, "pg_temp_", 8) == 0)
+		nsp_name = "pg_temp";
+	else if (strncmp(nsp_name, "pg_toast_temp_", 14) == 0)
+		nsp_name = "pg_toast_temp";
 
 	tcontext = sepgsql_get_label(DatabaseRelationId, MyDatabaseId, 0);
 	ncontext = sepgsql_compute_create(sepgsql_get_client_label(),
 									  tcontext,
-									  SEPG_CLASS_DB_SCHEMA);
-
+									  SEPG_CLASS_DB_SCHEMA,
+									  nsp_name);
 	/*
 	 * check db_schema:{create}
 	 */
-	snprintf(audit_name, sizeof(audit_name),
-			 "schema %s", NameStr(nspForm->nspname));
+	snprintf(audit_name, sizeof(audit_name), "schema %s", nsp_name);
 	sepgsql_avc_check_perms_label(ncontext,
 								  SEPG_CLASS_DB_SCHEMA,
 								  SEPG_DB_SCHEMA__CREATE,

contrib/sepgsql/selinux.c

@@ -836,7 +836,8 @@ sepgsql_compute_avd(const char *scontext,
 char *
 sepgsql_compute_create(const char *scontext,
 					   const char *tcontext,
-					   uint16 tclass)
+					   uint16 tclass,
+					   const char *objname)
 {
 	security_context_t ncontext;
 	security_class_t tclass_ex;
@@ -853,9 +854,11 @@ sepgsql_compute_create(const char *scontext,
 	 * Ask SELinux what is the default context for the given object class on a
 	 * pair of security contexts
 	 */
-	if (security_compute_create_raw((security_context_t) scontext,
-									(security_context_t) tcontext,
-									tclass_ex, &ncontext) < 0)
+	if (security_compute_create_name_raw((security_context_t) scontext,
+										 (security_context_t) tcontext,
+										 tclass_ex,
+										 objname,
+										 &ncontext) < 0)
 		ereport(ERROR,
 				(errcode(ERRCODE_INTERNAL_ERROR),
 				 errmsg("SELinux could not compute a new context: "

contrib/sepgsql/sepgsql-regtest.te

@@ -1,4 +1,4 @@
-policy_module(sepgsql-regtest, 1.04)
+policy_module(sepgsql-regtest, 1.05)
 
 gen_require(`
 	all_userspace_class_perms
@@ -43,6 +43,21 @@ allow sepgsql_regtest_dba_t sepgsql_regtest_user_t : process { dyntransition };
 allow sepgsql_regtest_dba_t sepgsql_regtest_foo_t : process { dyntransition };
 allow sepgsql_regtest_dba_t sepgsql_regtest_var_t : process { dyntransition };
 
+# special rule for system columns
+optional_policy(`
+	gen_require(`
+		attribute	sepgsql_table_type;
+		type		sepgsql_sysobj_t;
+	')
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "ctid";
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "oid";
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "xmin";
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "xmax";
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "cmin";
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "cmax";
+	type_transition sepgsql_regtest_dba_t sepgsql_table_type:db_column sepgsql_sysobj_t "tableoid";
+')
+
 #
 # Dummy domain for unpriv users
 #

contrib/sepgsql/sepgsql.h

@@ -239,7 +239,8 @@ extern void sepgsql_compute_avd(const char *scontext,
 
 extern char *sepgsql_compute_create(const char *scontext,
 					   const char *tcontext,
-					   uint16 tclass);
+					   uint16 tclass,
+					   const char *objname);
 
 extern bool sepgsql_check_perms(const char *scontext,
 					const char *tcontext,

contrib/sepgsql/sql/label.sql

@@ -71,10 +71,14 @@ SECURITY LABEL ON TABLE var_tbl
 CREATE TABLE t3 (s int, t text);
 INSERT INTO t3 VALUES (1, 'sss'), (2, 'ttt'), (3, 'uuu');
 
+-- @SECURITY-CONTEXT=unconfined_u:unconfined_r:sepgsql_regtest_dba_t:s0
+CREATE TABLE t4 (m int, n text);
+INSERT INTO t4 VALUES (1,'mmm'), (2,'nnn'), (3,'ooo');
+
+SELECT objtype, objname, label FROM pg_seclabels
+    WHERE provider = 'selinux' AND objtype = 'table' AND objname in ('t1', 't2', 't3');
 SELECT objtype, objname, label FROM pg_seclabels
-    WHERE provider = 'selinux'
-     AND  objtype in ('table', 'column')
-     AND  objname in ('t1', 't2', 't3');
+    WHERE provider = 'selinux' AND objtype = 'column' AND (objname like 't3.%' OR objname like 't4.%');
 
 --
 -- Tests for SECURITY LABEL
@@ -229,6 +233,7 @@ SELECT sepgsql_getcon();
 DROP TABLE IF EXISTS t1 CASCADE;
 DROP TABLE IF EXISTS t2 CASCADE;
 DROP TABLE IF EXISTS t3 CASCADE;
+DROP TABLE IF EXISTS t4 CASCADE;
 DROP FUNCTION IF EXISTS f1() CASCADE;
 DROP FUNCTION IF EXISTS f2() CASCADE;
 DROP FUNCTION IF EXISTS f3() CASCADE;

contrib/sepgsql/uavc.c

@@ -250,10 +250,10 @@ sepgsql_avc_compute(const char *scontext, const char *tcontext, uint16 tclass)
 	{
 		if (!ucontext)
 			ncontext = sepgsql_compute_create(scontext, tcontext,
-											  SEPG_CLASS_PROCESS);
+											  SEPG_CLASS_PROCESS, NULL);
 		else
 			ncontext = sepgsql_compute_create(scontext, ucontext,
-											  SEPG_CLASS_PROCESS);
+											  SEPG_CLASS_PROCESS, NULL);
 		if (strcmp(scontext, ncontext) == 0)
 		{
 			pfree(ncontext);

doc/src/sgml/sepgsql.sgml

@@ -63,7 +63,7 @@
     <filename>sepgsql</> can only be used on <productname>Linux</productname>
     2.6.28 or higher with <productname>SELinux</productname> enabled.
     It is not available on any other platform.  You will also need
-    <productname>libselinux</> 2.0.99 or higher and
+    <productname>libselinux</> 2.1.10 or higher and
     <productname>selinux-policy</> 3.9.13 or higher (although some
     distributions may backport the necessary rules into older policy
     versions).
@@ -326,8 +326,9 @@ $ sudo semodule -r sepgsql-regtest
     When <filename>sepgsql</filename> is in use, security labels are
     automatically assigned to supported database objects at creation time.
     This label is called a default security label, and is decided according
-    to the system security policy, which takes as input the creator's label
-    and the label assigned to the new object's parent object.
+    to the system security policy, which takes as input the creator's label,
+    the label assigned to the new object's parent object and optionally name
+    of the constructed object.
    </para>
 
    <para>