Index: ipp.c
===================================================================
--- ipp.c	(revision 7233)
+++ ipp.c	(working copy)
@@ -9975,6 +9975,8 @@
 {
   int		i;			/* Looping var */
   struct passwd	*pw;			/* User password data */
+  char		baseuser[256],		/* Base username */
+		*baseptr;		/* Pointer to "@" in base username */
 
 
   if (p->num_users == 0)
@@ -9983,6 +9985,20 @@
   if (!strcmp(username, "root"))
     return (1);
 
+  if (strchr(username, '@'))
+  {
+   /*
+    * Strip @REALM for username check...
+    */
+
+    strlcpy(baseuser, username, sizeof(baseuser));
+
+    if ((baseptr = strchr(baseuser, '@')) != NULL)
+      *baseptr = '\0';
+
+    username = baseuser;
+  }
+
   pw = getpwnam(username);
   endpwent();