I think I reported this bug back in the samba 2.2 days,  but I notice it hasn't
been fixed.

The rhosts files have for the past few years already had '\n' line
terminators stripped by the input routines, but the parsing code
hasn't been updated to match.


--- samba-3.0.4/source/auth/auth_rhosts.c.Orig  2004-06-03 20:56:39.000000000 -0400
+++ samba-3.0.4/source/auth/auth_rhosts.c       2004-06-03 20:56:21.000000000 -0400
@@ -42,7 +42,7 @@
     char *buf = lines[i];
     trim_char(buf,' ',' ');
 
-    if (buf[0] != '#' && buf[0] != '\n') 
+    if (buf[0] != '#' && buf[0] != '\0') 
     {
       BOOL is_group = False;
       int plus = 1;
@@ -56,7 +56,7 @@
        if (buf[0] == '+') 
        {
          bp++;
-         if (*bp == '\n' && plus_allowed) 
+         if (*bp == '\0' && plus_allowed) 
          {
            /* a bare plus means everbody allowed */
            DEBUG(6, ("check_user_equiv everybody allowed\n"));