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+Network Working Group                                   Assar Westerlund
+<draft-ietf-cat-krb5-tcp.txt>                                       SICS
+Internet-Draft                                          Johan Danielsson
+November, 1997                                                  PDC, KTH
+Expire in six months
+
+                           Kerberos over TCP
+
+Status of this Memo
+
+   This document is an Internet-Draft.  Internet-Drafts are working
+   documents of the Internet Engineering Task Force (IETF), its areas,
+   and its working groups.  Note that other groups may also distribute
+   working documents as Internet-Drafts.
+
+   Internet-Drafts are draft documents valid for a maximum of six months
+   and may be updated, replaced, or obsoleted by other documents at any
+   time.  It is inappropriate to use Internet- Drafts as reference
+   material or to cite them other than as "work in progress."
+
+   To view the entire list of current Internet-Drafts, please check the
+   "1id-abstracts.txt" listing contained in the Internet-Drafts Shadow
+   Directories on ftp.is.co.za (Africa), ftp.nordu.net (Europe),
+   munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or
+   ftp.isi.edu (US West Coast).
+
+   Distribution of this memo is unlimited.  Please send comments to the
+   <cat-ietf@mit.edu> mailing list.
+
+Abstract
+
+   This document specifies how the communication should be done between
+   a client and a KDC using Kerberos [RFC1510] with TCP as the transport
+   protocol.
+
+Specification
+
+   This draft specifies an extension to section 8.2.1 of RFC1510.
+
+   A Kerberos server MAY accept requests on TCP port 88 (decimal).
+
+   The data sent from the client to the KDC should consist of 4 bytes
+   containing the length, in network byte order, of the Kerberos
+   request, followed by the request (AS-REQ or TGS-REQ) itself.  The
+   reply from the KDC should consist of the length of the reply packet
+   (4 bytes, network byte order) followed by the packet itself (AS-REP,
+   TGS-REP, or KRB-ERROR).
+
+
+
+
+Westerlund, Danielsson                                          [Page 1]
+
+Internet Draft             Kerberos over TCP              November, 1997
+
+
+   C->S: Open connection to TCP port 88 at the server
+   C->S: length of request
+   C->S: AS-REQ or TGS-REQ
+   S->C: length of reply
+   S->C: AS-REP, TGS-REP, or KRB-ERROR
+
+Discussion
+
+   Even though the preferred way of sending kerberos packets is over UDP
+   there are several occasions when it's more practical to use TCP.
+
+   Mainly, it's usually much less cumbersome to get TCP through
+   firewalls than UDP.
+
+   In theory, there's no reason for having explicit length fields, that
+   information is already encoded in the ASN1 encoding of the Kerberos
+   packets.  But having explicit lengths makes it unnecessary to have to
+   decode the ASN.1 encoding just to know how much data has to be read.
+
+   Another way of signaling the end of the request of the reply would be
+   to do a half-close after the request and a full-close after the
+   reply.  This does not work well with all kinds of firewalls.
+
+Security considerations
+
+   This memo does not introduce any known security considerations in
+   addition to those mentioned in [RFC1510].
+
+References
+
+   [RFC1510] Kohl, J. and Neuman, C., "The Kerberos Network
+   Authentication Service (V5)", RFC 1510, September 1993.
+
+Authors' Addresses
+
+   Assar Westerlund
+   Swedish Institute of Computer Science
+   Box 1263
+   S-164 29  KISTA
+   Sweden
+
+   Phone: +46-8-7521526
+   Fax:   +46-8-7517230
+   EMail: assar@sics.se
+
+   Johan Danielsson
+   PDC, KTH
+   S-100 44  STOCKHOLM
+
+
+
+Westerlund, Danielsson                                          [Page 2]
+
+Internet Draft             Kerberos over TCP              November, 1997
+
+
+   Sweden
+
+   Phone: +46-8-7907885
+   Fax:   +46-8-247784
+   EMail: joda@pdc.kth.se
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+Westerlund, Danielsson                                          [Page 3]
+