RFC 1929 (rfc1929) - Page 1 of 2

Username/Password Authentication for SOCKS V5

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Network Working Group                                           M. Leech
Request for Comments: 1929                    Bell-Northern Research Ltd
Category: Standards Track                                     March 1996


             Username/Password Authentication for SOCKS V5

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

1.  Introduction

   The protocol specification for SOCKS Version 5 specifies a
   generalized framework for the use of arbitrary authentication
   protocols in the initial socks connection setup. This document
   describes one of those protocols, as it fits into the SOCKS Version 5
   authentication "subnegotiation".

Note:

   Unless otherwise noted, the decimal numbers appearing in packet-
   format diagrams represent the length of the corresponding field, in
   octets.  Where a given octet must take on a specific value, the
   syntax X'hh' is used to denote the value of the single octet in that
   field. When the word 'Variable' is used, it indicates that the
   corresponding field has a variable length defined either by an
   associated (one or two octet) length field, or by a data type field.

2.  Initial negotiation

   Once the SOCKS V5 server has started, and the client has selected the
   Username/Password Authentication protocol, the Username/Password
   subnegotiation begins.  This begins with the client producing a
   Username/Password request:

           +----+------+----------+------+----------+
           |VER | ULEN |  UNAME   | PLEN |  PASSWD  |
           +----+------+----------+------+----------+
           | 1  |  1   | 1 to 255 |  1   | 1 to 255 |
           +----+------+----------+------+----------+






Leech                       Standards Track
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