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From "Raman Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SSHD-679) Support (or ignore) IUTF8 terminal mode (42)
Date Mon, 25 Jul 2016 18:40:20 GMT
Raman Gupta created SSHD-679:

             Summary: Support (or ignore) IUTF8 terminal mode (42)
                 Key: SSHD-679
                 URL: https://issues.apache.org/jira/browse/SSHD-679
             Project: MINA SSHD
          Issue Type: Improvement
    Affects Versions: 1.2.0, 1.1.1, 0.14.0
            Reporter: Raman Gupta

My version of openssh running on Fedora 23 is:

OpenSSH_7.2p2, OpenSSL 1.0.2h-fips  3 May 2016

When connecting to an sshd server using this client, the client transmits terminal mode 42
(IUTF8 terminal, see https://tools.ietf.org/html/draft-sgtatham-secsh-iutf8-01).

The server however does not define this mode and breaks out of the loop processing the client
terminal modes with the warning:

Unknown pty opcode value: 42

As per the spec (https://tools.ietf.org/html/rfc4254#page-19) only opcodes 160 to 255 should
cause parsing to stop. Other opcodes, if not understood by the server (such as opcode 42)
should be ignored. However, currently opcodes less than 160 cause parsing to stop as well.

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