[sudo-workers] Empty SUDOERS_SEARCH_FILTER bug

[Todd C. Miller]

I see now.  I had a group plugin defined so the constructed filter
was different.  When I disable that I get the invalid search filter.
The fix is to add the missing logical OR.  The bug was introduced
in sudo 1.8.10 via https://www.sudo.ws/repos/sudo/rev/54856973af41

 - todd

diff -r 29603b0a4315 plugins/sudoers/ldap.c
--- a/plugins/sudoers/ldap.c	Tue Aug 29 08:58:14 2017 -0600
+++ b/plugins/sudoers/ldap.c	Thu Aug 31 10:43:23 2017 -0600
@@ -1847,7 +1847,7 @@ sudo_ldap_build_pass2(void)
 	    ldap_conf.timed ? timebuffer : "",
 	    (ldap_conf.timed || ldap_conf.search_filter) ? ")" : "");
     } else {
-	len = asprintf(&filt, "%s%s(sudoUser=*)(sudoUser=%s*)%s%s",
+	len = asprintf(&filt, "%s%s(|(sudoUser=*)(sudoUser=%s*))%s%s",
 	    (ldap_conf.timed || ldap_conf.search_filter) ? "(&" : "",
 	    ldap_conf.search_filter ? ldap_conf.search_filter : "",
 	    query_netgroups ? "+" : "%:",