RFC 1411 (rfc1411) - Page 1 of 4

Telnet Authentication: Kerberos Version 4

Network Working Group                                  D. Borman, Editor
Request for Comments: 1411                           Cray Research, Inc.
                                                            January 1993


               Telnet Authentication: Kerberos Version 4

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  Discussion and suggestions for improvement are requested.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

1. Command Names and Codes

   Authentication Types

      KERBEROS_V4  1

   Suboption Commands

      AUTH         0
      REJECT       1
      ACCEPT       2
      CHALLENGE    3
      RESPONSE     4

2.  Command Meanings

   IAC SB AUTHENTICATION IS  AUTH  IAC SE

      This is used to pass the Kerberos ticket to the remote side of the
      connection.  The first octet of the 
      value is KERBEROS_V4, to indicate the usage of Kerberos version 4.

   IAC SB AUTHENTICATION REPLY  ACCEPT IAC SE

      This command indicates that the authentication was successful.

   IAC SB AUTHENTICATION REPLY  REJECT
    IAC SE

      This command indicates that the authentication was not successful,
      and if there is any more data in the sub-option, it is an ASCII
      text message of the reason for the rejection.



Telnet Working Group