Re: Bug(wish) with Ncat

[דוד חי גוטויליג <gootvilig.davidhai () gmail com>]

2010/7/23 David Fifield <david () bamsoftware com>
> > Also in the release version (5.21), I have encountered a problem with the
> > socks4 proxy when Ncat is been used inside OpenSSH client's ProxyCommand,
> > for some reason Ncat will not pass the incoming stream back to the ssh
> > client. I couldn't figure way.
> >
> > Here is a sample output:
> >
> > OpenSSH_5.4p1, OpenSSL 1.0.0a-fips 1 Jun 2010
> > debug1: Reading configuration data /etc/ssh/ssh_config
> > debug1: Applying options for *
> > debug2: ssh_connect: needpriv 0
> > debug1: Executing proxy command: exec ncat -v --proxy
> > 127.0.0.1:4444--proxy-type socks4 SOMESERVER 22
> > .....
> > .....
> > Ncat: Version 5.21 ( http://nmap.org/ncat )
> > Ncat: Connected to proxy 127.0.0.1:4444
> > debug1: ssh_exchange_identification:
> >
> > and here it's just hangs.
>
> Does this happen with the latest version too? Please post the exact
> commands your are using (you can use SOMESERVER in place of the server
> name). This includes the ssh command and the command to start the proxy.
>
> David Fifield
With version 5.21 it does happen. like this:
first create tunnel with OpenSSH like:
ssh -NvD 6060 user@SERVER
then use it like:
ssh -o ProxyCommand="ncat --proxy 127.0.0.1:6060 --proxy-type socks4
SERVER 22" user@SERVER

this just hangs. but if I use netcat it works, something like:
ssh -o ProxyCommand="nc -x 127.0.0.1:6060 -X 5 SERVER 22" user@SERVER

this happen also for version 5.35DC1
and also for latest revision (19221 as writing, version option prints 5.35DC18).

--dhg
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