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https://issues.apache.org/jira/browse/SSHD-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16315385#comment-16315385
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Andreas Haufler commented on SSHD-792:
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localhost is 127.0.0.1 (PING localhost (127.0.0.1): 56 data bytes...)
ssh -V
OpenSSH_7.6p1, LibreSSL 2.6.2
Same also happens in my linux environment:
*ssh -V*
OpenSSH_7.2p2 Ubuntu-4ubuntu2.2, OpenSSL 1.0.2g 1 Mar 2016
*System:*
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
ssh locally always shows this warning:
WARNING: Server requests forwarding for unknown listen_port 10023
The difference between MINA sshd and OpenSSH is in the incoming
"forwarded-tcpip" call:
using ssh -vvv MINA sends:
*debug1: client_request_forwarded_tcpip: listen {color:red}127.0.0.1{color}
port 10001, originator 127.0.0.1 port 57474
WARNING: Server requests forwarding for unknown listen_port 10001*
OpenSSH sends:
*debug1: client_request_forwarded_tcpip: listen {color:red}localhost{color}
port 10001, originator 127.0.0.1 port 43308*
...not planning to do any nasty IPv6 stuff ;-)
> Remote Port-Forwarding uses invalid "original host" values
> ----------------------------------------------------------
>
> Key: SSHD-792
> URL: https://issues.apache.org/jira/browse/SSHD-792
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 1.6.0
> Environment: Java 8
> OSX
> Reporter: Andreas Haufler
>
> When starting a server which accepts all kinds of port forwarding:
> sshd.setTcpipForwardingFilter(new StaticDecisionForwardingFilter(true));
> remote port-forwarding doesn't work (at least when connecting from OSX)
> unless a specific address is given:
> ssh localhost -p 2222 -R10001:localhost:80 <- doesn't work
> ssh localhost -p 2222 -R127.0.0.1:10001:localhost:80 <- does work
> As far as I can tell, TcpipClientChannel.java:98 uses the underlying
> socket-address
> of the effective connection and transmit the host (which is either 127.0.0.1
> or ::1) on OSX.
> However, the client (ssh) would want to see "localhost" as original host in
> order to permit tunneling.
> Is there anything I am missing? Otherwise I could provide a PR which fixes
> this (by remembering the originally requested host and reporting that back).
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