IUTF8 Terminal Mode in Secure Shell (SSH)
RFC 8160

New version available: quot; defined in Section 8 of [RFC4254].

   IANA has added the following opcode to the "Pseudo-Terminal Encoded
   Terminal Modes" registry:

   opcode  mnemonic       description
   ------  --------       -----------
   42      IUTF8          Terminal input and output is assumed to be
                           encoded in UTF-8.

5.  Security Considerations

   The security considerations of [RFC4254] apply.  This additional
   terminal mode encoding is believed to have no security implications
   differing from the existing set of encoded terminal modes.

   Since the IUTF8 terminal mode is intended for use in conjunction with
   the UTF-8 character encoding, the security considerations of
   [RFC3629] also apply to systems in which this mode is enabled.  In
   particular, terminal drivers that interpret this bit as enabling
   UTF-8-aware line-editing behavior should carefully consider how that
   behavior will treat illegal sequences, overlong encodings, and
   redundant representations of composed characters (see [UNICODE]).

6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC3629]  Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, RFC 3629, DOI 10.17487/RFC3629, November
              2003, <http://www.rfc-editor.org/info/rfc3629>.

   [RFC4254]  Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
              Connection Protocol", RFC 4254, DOI 10.17487/RFC4254,
              January 2006, <http://www.rfc-editor.org/info/rfc4254>.

6.2.  Informative References

   [UNICODE]  The Unicode Consortium, "The Unicode Standard",
              <http://www.unicode.org/versions/latest/>.

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RFC 8160               IUTF8 Terminal Mode in SSH             April 2017

Acknowledgements

   The authors are indebted to Colin Watson for originally suggesting
   this terminal mode in 2005, and David Madore and Jakub Jelen for
   prior implementation efforts.

Authors' Addresses

   Simon Tatham
   PuTTY

   Email: anakin@pobox.com

   Darren Tucker
   OpenSSH

   Email: dtucker@openssh.com

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