外文翻译---SMTP服务扩展的认证机制
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1、外文文献原文 SMTP Service Extension for Authentication 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 standard
2、ization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (1999). All Rights Reserved. 1. Introduction This document defines an SMTP service extension ESMTP whereby an SMTP client may indicate an authentication mechanism to
3、 the server,perform an authentication protocol exchange, and optionally negotiatea security layer for subsequent protocol interactions. This extension is a profile of the Simple Authentication and Security Layer SASL. 2. Conventions Used in this Document In examples, C: and S: indicate lines sent by
4、 the client and server respectively. The key words MUST, MUST NOT, SHOULD, SHOULD NOT, and MAY in this document are to be interpreted as defined in Key words for use in RFCs to Indicate Requirement Levels KEYWORDS. 3. The Authentication service extension (1) the name of the SMTP service extension is
5、 Authentication (2) the EHLO keyword value associated with this extension is AUTH (3) The AUTH EHLO keyword contains as a parameter a space separated list of the names of supported SASL mechanisms. (4) a new SMTP verb AUTH is defined (5) an optional parameter using the keyword AUTH is added to the M
6、AIL FROM command, and extends the maximum line length of the MAIL FROM command by 500 characters. (6) this extension is appropriate for the submission protocol SUBMIT. 4. The AUTH command AUTH mechanism initial-response Arguments: a string identifying a SASL authentication mechanism. an optional bas
7、e64-encoded response Restrictions: After an AUTH command has successfully completed, no more AUTH commands may be issued in the same session. After a successful AUTH command completes, a server MUST reject any further AUTH commands with a 503 reply. The AUTH command is not permitted during a mail tr
8、ansaction. Discussion: The AUTH command indicates an authentication mechanism to the server. If the server supports the requested authentication mechanism, it performs an authentication protocol exchange to authenticate and identify the user. Optionally, it also negotiates a security layer for subse
9、quent protocol interactions. If the requested authentication mechanism is not supported, the server rejects the AUTH command with a 504 reply. The authentication protocol exchange consists of a series of server challenges and client answers that are specific to the authentication mechanism. A server
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