--- shadow-4.0.4.1/libmisc/chkname.c.orig	2006-03-07 19:13:50 +0200
+++ shadow-4.0.4.1/libmisc/chkname.c	2006-03-07 19:14:32 +0200
@@ -27,6 +27,7 @@
 	while (*++name) {
 		if (!((*name >= 'a' && *name <= 'z') ||
 		      (*name >= '0' && *name <= '9') ||
+		      *name == '.' ||
 		      *name == '_' || *name == '-' ||
 		      (*name == '$' && *(name + 1) == '\0')))
 			return 0;