Require execute permission on the trigger function for CREATE TRIGGER.

This check was overlooked when we added function execute permissions to the
system years ago.  For an ordinary trigger function it's not a big deal,
since trigger functions execute with the permissions of the table owner,
so they couldn't do anything the user issuing the CREATE TRIGGER couldn't
have done anyway.  However, if a trigger function is SECURITY DEFINER,
that is not the case.  The lack of checking would allow another user to
install it on his own table and then invoke it with, essentially, forged
input data; which the trigger function is unlikely to realize, so it might
do something undesirable, for instance insert false entries in an audit log
table.

Reported by Dinesh Kumar, patch by Robert Haas

Security: CVE-2012-0866

doc/src/sgml/ref/create_trigger.sgml

@@ -362,7 +362,8 @@ UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</
 
   <para>
    To create a trigger on a table, the user must have the
-   <literal>TRIGGER</literal> privilege on the table.
+   <literal>TRIGGER</literal> privilege on the table.  The user must
+   also have <literal>EXECUTE</literal> privilege on the trigger function.
   </para>
 
   <para>

src/backend/commands/trigger.c

@@ -108,8 +108,8 @@ static void AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
  * if TRUE causes us to modify the given trigger name to ensure uniqueness.
  *
  * When isInternal is not true we require ACL_TRIGGER permissions on the
- * relation.  For internal triggers the caller must apply any required
- * permission checks.
+ * relation, as well as ACL_EXECUTE on the trigger function.  For internal
+ * triggers the caller must apply any required permission checks.
  *
  * Note: can return InvalidOid if we decided to not create a trigger at all,
  * but a foreign-key constraint.  This is a kluge for backwards compatibility.
@@ -377,6 +377,13 @@ CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
 	 * Find and validate the trigger function.
 	 */
 	funcoid = LookupFuncName(stmt->funcname, 0, fargtypes, false);
+	if (!isInternal)
+	{
+		aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, ACL_KIND_PROC,
+						   NameListToString(stmt->funcname));
+	}
 	funcrettype = get_func_rettype(funcoid);
 	if (funcrettype != TRIGGEROID)
 	{