draft-ietf-dnsop-serverid-04.txt

bind 源码 最新实现 linux/unix/windows平台

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4.  Characteristics of an Implementation Neutral Convention

   The discussion above of advantages and disadvantages to the
   HOSTNAME.BIND mechanism suggest some requirements for a better
   solution to the server identification problem.  These are summarized
   here as guidelines for any effort to provide appropriate protocol
   extensions:
   1.  The mechanism adopted MUST be in-band for the DNS protocol.  That
       is, it needs to allow the query for the server's identifying
       information to be part of a normal, operational query.  It SHOULD
       also permit a separate, dedicated query for the server's
       identifying information.
   2.  The new mechanism SHOULD not require dedicated namespaces or
       other reserved values outside of the existing protocol mechanisms
       for these, i.e.  the OPT pseudo-RR.  In particular, it should not
       propagate the existing drawback of requiring support for a CLASS
       and top level domain in the authoritative server (or the querying
       tool) to be useful.
   3.  Support for the identification functionality SHOULD be easy to
       implement and easy to enable.  It MUST be easy to disable and
       SHOULD lend itself to access controls on who can query for it.
   4.  It should be possible to return a unique identifier for a server
       without requiring the exposure of information that may be
       non-public and considered sensitive by the operator, such as a
       hostname or unicast IP address maintained for administrative
       purposes.
   5.  The identification mechanism SHOULD NOT be
       implementation-specific.























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5.  IANA Considerations

   This document proposes no specific IANA action.  Protocol extensions,
   if any, to meet the requirements described are out of scope for this
   document.  Should such extensions be specified and adopted by normal
   IETF process, the specification will include appropriate guidance to
   IANA.












































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6.  Security Considerations

   Providing identifying information as to which server is responding to
   a particular query from a particular location in the Internet can be
   seen as information leakage and thus a security risk.  This motivates
   the suggestion above that a new mechanism for server identification
   allow the administrator to disable the functionality altogether or
   partially restrict availability of the data.  It also suggests that
   the serverid data should not be readily correlated with a hostname or
   unicast IP address that may be considered private to the nameserver
   operator's management infrastructure.

   Propagation of protocol or service meta-data can sometimes expose the
   application to denial of service or other attack.  As DNS is a
   critically important infrastructure service for the production
   Internet, extra care needs to be taken against this risk for
   designers, implementors, and operators of a new mechanism for server
   identification.

































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7.  Acknowledgements

   The technique for host identification documented here was initially
   implemented by Paul Vixie of the Internet Software Consortium in the
   Berkeley Internet Name Daemon package.  Comments and questions on
   earlier drafts were provided by Bob Halley, Brian Wellington, Andreas
   Gustafsson, Ted Hardie, Chris Yarnell, Randy Bush, and members of the
   ICANN Root Server System Advisory Committee.  The newest version
   takes a significantly different direction from previous versions,
   owing to discussion among contributors to the DNSOP working group and
   others, particularly Olafur Gudmundsson, Ed Lewis, Bill Manning, Sam
   Weiler, and Rob Austein.







































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