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- Network Working Group Mike StJohns
- Request for Comments: 912 TPSC
- September 1984
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- Authentication Service
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- STATUS OF THIS MEMO
-
- This RFC suggests a proposed protocol for the ARPA-Internet
- community, and requests discussion and suggestions for improvements.
- Distribution of this memo is unlimited.
-
- INTRODUCTION
-
- The Authentication Server provides a means to determine the identity
- of a user of a particular TCP connection. Given a TCP port number
- pair, it returns a character string which identifies the owner of
- that connection on the server's system. Suggested uses include
- automatic identification and verification of a user during an FTP
- session, additional verification of a TAC dial up user, and access
- verification for a generalized network file server.
-
- OVERVIEW
-
- This is a connection based application on TCP. A server listens for
- TCP connections on TCP port 113 (decimal). Once a connection is
- established, the server reads one line of data which specifies the
- connection of interest. If it exists, the system dependent user
- identifier of the connection of interest is sent out the connection.
- The service closes the connection after sending the user identifier.
-
- RESTRICTIONS
-
- Queries are permitted only for fully specified connections. The
- local/foreign host pair used to fully specify the connection are
- taken from the query connection. This means a user on Host A may
- only query the server on Host B about connections between A and B.
-
- QUERY/RESPONSE FORMAT
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- The server accepts simple text query requests of the form
-
- <local-port>, <foreign-port>
-
- where <local-port>, is the TCP port (decimal) on the target (server)
- system, and <foreign-port> is the TCP port (decimal) on the source
- (user) system.
-
- For example:
-
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- StJohns [Page 1]
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- RFC 912 September 1984
- Authentication Service
-
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- 23, 6191
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- The response is of the form
-
- <local-port>, <foreign-port> : <response-type> : <additional-info>
-
- where <local-port>, <foreign-port> are the same pair as the query,
- <response-type> is a keyword identifying the type of response, and
- <additional info> is context dependent.
-
- For example:
-
- 23, 6191 : USERID : StJohns
-
- RESPONSE TYPES
-
- A response can be one of two types:
-
- USERID
-
- In this case, <additional-info> is the printable representation of
- the user identifier of the owner of the connection. The format of
- the returned user identifier is completely system dependent.
-
- ERROR
-
- For some reason the owner of the TCP port could not be determined,
- <additional-info> tells why. The following are suggested values
- of <additional-info> and their meanings.
-
- INVALID PORT
-
- Either the local or foreign port was improperly specified.
-
- NO USER
-
- The connection specified by the port pair is not currently
- in use.
-
- UNKNOWN ERROR
-
- Can't determine connection owner; reason unknown.
- Other values may be specified as necessary.
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- StJohns [Page 2]
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- RFC 912 September 1984
- Authentication Service
-
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- CAVEATS
-
- Unfortunately, the trustworthiness of the various host systems that
- might implement an authentication server will vary quite a bit. It
- is up to the various applications that will use the server to
- determine the amount of trust they will place in the returned
- information. It may be appropriate in some cases restrict the use of
- the server to within a locally controlled subnet.
-
- APPLICATIONS
-
- 1) Automatic user authentication for FTP.
-
- 2) Verification for privileged network operations. For example,
- having the server start or stop special purpose servers.
-
- DISCLAIMER
-
- I designed this protocol to allow me to eliminate the bother of
- having to identify myself before continuing an FTP session.
-
- Since I started work on it, other applications appeared. I have
- tried to consider all of our applications while still making this as
- general as possible.
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- StJohns [Page 3]
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