--- shadow-4.0.3.old/libmisc/chkname.c	2002-01-10 13:04:34.000000000 +0000
+++ shadow-4.0.3.old/libmisc/chkname.c	2003-06-16 21:19:12.000000000 +0000
@@ -22,15 +22,15 @@ 
 good_name(const char *name)
 {
 	/*
-	 * User/group names must match [a-z_][a-z0-9_-]*
+	 * User/group names must match [a-z_][a-z0-9_-.]*
 	 */
-	if (!*name || !((*name >= 'a' && *name <= 'z') || *name == '_'))
+	if (!*name || !((*name >= 'a' && *name <= 'z') || *name == '_' || *name == '.'))
 		return 0;
 
 	while (*++name) {
 		if (!((*name >= 'a' && *name <= 'z') ||
 		    (*name >= '0' && *name <= '9') ||
-		    *name == '_' || *name == '-' ||
+		    *name == '_' || *name == '-' || *name == '.' ||
 		    (*name == '$' && *(name+1) == NULL)))
 			return 0;
 	}