RFC 6270 - The 'tn3270' URI Scheme

RFC 6270 - The 'tn3270' URI Scheme
Internet Engineering Task Force (IETF) M. Yevstifeyev
Request for Comments: 6270 June 2011
Updates:
1041
1738
2355
Category: Standards Track
ISSN: 2070-1721
The 'tn3270' URI Scheme
Abstract

This document is the specification of the 'tn3270' Uniform Resource
Identifier (URI) scheme, which is used to designate the access to the
resources available via Telnet 3270 mode (TN3270) and Telnet 3270
Enhanced mode (TN3270E). It updates
RFC 1041
and
RFC 2355
, which
specify these protocols, and
RFC 1738
, which firstly mentioned this
URI scheme without defining its syntax and semantics.

Status of This Memo

This is an Internet Standards Track document.

This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in
Section 2 of RFC 5741

Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at

This document is subject to
BCP 78
and the IETF Trust's Legal
Provisions Relating to IETF Documents
) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Yevstifeyev Standards Track [Page 1]
RFC 6270
The 'tn3270' URI Scheme June 2011
Table of Contents
. Introduction ....................................................
1.1
. Terminology ................................................
. URI Scheme Definition ...........................................
2.1
. URI Scheme Syntax ..........................................
2.2
. URI Scheme Semantics .......................................
. Security Considerations .........................................
. IANA Considerations .............................................
. References ......................................................
5.1
. Normative References .......................................
5.2
. Informative References .....................................
Appendix A
. Acknowledgments ........................................
. Introduction
This document specifies the 'tn3270' Uniform Resource Identifier
(URI) scheme, which is used to designate the access to the resources
available via Telnet 3270 mode (TN3270) and Telnet 3270 Enhanced mode
(TN3270E).

Telnet 3270 mode (TN3270) is a name used to denote the special mode
of Telnet session [
RFC0854
]. If it is used, the 3270 data stream
GA23-0059
] is used when transmitting data during the Telnet session,
whereas the Telnet 3270 Regime option [
RFC1041
] is used to enable and
negotiate its use. (See [
RFC1576
] for some other background
information on TN3270.) Telnet 3270 Enhanced mode (TN3270E) has a
similar principle; see
RFC 2355
RFC2355
] for its specification.

The 'tn3270' URI scheme was firstly mentioned in
RFC 1738
RFC1738
as used in URIs that designate the access to "Interactive 3270
emulation sessions". Following the creation of the URI schemes
registry per
RFC 4395
RFC4395
], this scheme was added to the
"Provisional URI Schemes" sub-registry in the "Uniform Resource
Identifier (URI) Schemes" IANA registry [
URIREG
]. However,
RFC 1738
RFC1738
] does not give any definition of syntax or semantics of the
'tn3270' URIs and does not have any guidelines for registration of
this scheme.

Since there is no acceptable specification of the 'tn3270' URI, there
is a risk that somebody might try to implement it with some new,
possibly undocumented, syntax, just by looking at the IANA registry.
In order to minimize such risk, this document gives a precise
definition of syntax, semantics, use of this URI, and it registers
the corresponding scheme. It also updates
RFC 2355
RFC2355
],
RFC
1738
RFC1738
], and
RFC 1041
RFC1041
].
Yevstifeyev Standards Track [Page 2]
RFC 6270
The 'tn3270' URI Scheme June 2011
The generic syntax of URIs is described in
RFC 3986
RFC3986
].
Registration procedures for new URI schemes are defined in
RFC 4395
RFC4395
].
1.1
. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in
RFC 2119
RFC2119
].
. URI Scheme Definition
2.1
. URI Scheme Syntax
The 'tn3270' URI takes the following form (the syntax below is non-
normative):

tn3270://@:/

where the part with the "@" (at) sign character, as well
as the part with the preceding ":" (colon) character, is
OPTIONAL.

The normative syntax of the 'tn3270' URI is defined in
ABNF [
RFC5234
] rule:

tn3270-uri = "tn3270:" "//" authority ["/"]

where the rule is specified in
RFC 3986
RFC3986
].

The semantics of each part of the 'tn3270' URI are defined below, in
Section 2.2
2.2
. URI Scheme Semantics
The part of the 'tn3270' URI, which is REQUIRED, denotes the
host to which the TN3270 or TN3270E connection is to be established.
The part is considered to define the information for use
in the Telnet Authentication option [
RFC2941
], which might be used
during the TN3270 or TN3270E session. The part, if present,
denotes the port on which the TCP connection to the is to be
established. If it is absent, the default port SHALL be 23, as
registered in [
PORTREG
].
. Security Considerations
Generic security considerations for the usage of URIs are discussed
in
Section 7 of [RFC3986]
Yevstifeyev Standards Track [Page 3]
RFC 6270
The 'tn3270' URI Scheme June 2011
Since 'tn3270' URIs provide access to services that are available via
TN3270 and TN3270E, which do not add any new security issues to the
Telnet session, as they are a modified form of it, there are no other
security considerations for 'tn3270' URIs that are not discussed in
RFC 4248
RFC4248
], the 'telnet' URI scheme specification.

The Telnet protocol, as well as TN3270 and TN3270E, is inherently
insecure. Those needing remote login access and related services are
encouraged to use a more secure technology, such as Secure Shell
RFC4251
].
. IANA Considerations
IANA updated the registration of the 'tn3270' URI scheme using the
following registration template (see [
RFC4395
]):

URI scheme name: tn3270

Status: Permanent

URI scheme syntax: see
Section 2.1 of RFC 6270
URI scheme semantics: see
Section 2.2 of RFC 6270
URI scheme encoding considerations: there are no other encoding
considerations for 'tn3270' URIs that are not described in
RFC
3986
RFC3986

Protocols that use the scheme: Telnet 3270 mode (TN3270) [
RFC1041
and Telnet 3270 Enhanced Mode (TN3270E) [
RFC2355

Security considerations: see
Section 3 of RFC 6270
Contact: IESG

Author/Change controller: IETF

References: see
Section 5 of RFC 6270
. References
5.1
. Normative References
RFC1041
] Rekhter, Y., "Telnet 3270 regime option",
RFC 1041
January 1988.

RFC2119
] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels",
BCP 14
RFC 2119
, March 1997.
Yevstifeyev Standards Track [Page 4]
RFC 6270
The 'tn3270' URI Scheme June 2011
RFC2355
] Kelly, B., "TN3270 Enhancements",
RFC 2355
, June 1998.

RFC3986
] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC
3986
, January 2005.

RFC4248
] Hoffman, P., "The telnet URI Scheme",
RFC 4248
, October
2005.

RFC5234
] Crocker, D., Ed., and P. Overell, "Augmented BNF for
Syntax Specifications: ABNF", STD 68,
RFC 5234
, January
2008.
5.2
. Informative References
GA23-0059
] IBM Corporation, "IBM 3270 Information Display System.
Data Stream Programmer's Reference", IBM Publication
GA23-0059, July 1992.

PORTREG
] Internet Assigned Numbers Authority (IANA) Registry,
"Port Numbers", <
>.

RFC0854
] Postel, J. and J. Reynolds, "Telnet Protocol
Specification", STD 8,
RFC 854
, May 1983.

RFC1576
] Penner, J., "TN3270 Current Practices",
RFC 1576
, January
1994.

RFC1738
] Berners-Lee, T., Masinter, L., and M. McCahill, "Uniform
Resource Locators (URL)",
RFC 1738
, December 1994.

RFC2941
] Ts'o, T., Ed., and J. Altman, "Telnet Authentication
Option",
RFC 2941
, September 2000.

RFC4251
] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
Protocol Architecture",
RFC 4251
, January 2006.

RFC4395
] Hansen, T., Hardie, T., and L. Masinter, "Guidelines and
Registration Procedures for New URI Schemes",
BCP 35
RFC
4395
, February 2006.

URIREG
] Internet Assigned Numbers Authority (IANA) Registry,
"Uniform Resource Identifier (URI) Schemes",
>.
Yevstifeyev Standards Track [Page 5]
RFC 6270
The 'tn3270' URI Scheme June 2011
Appendix A
. Acknowledgments
Many thanks to Alfred Hoenes, Graham Klyne, Alexey Melnikov, Julian
Reschke, and Peter Saint-Andre for their input to this document.

Author's Addresses

Mykyta Yevstifeyev
8 Kuzovkov St., flat 25,
Kotovsk
Ukraine

EMail: evnikita2@gmail.com

Yevstifeyev Standards Track [Page 6]
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