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Home > Archive > Unix administration > October 2007 > How to change telnet service under ssh
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How to change telnet service under ssh
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| Bo Yang 2007-10-23, 7:32 am |
| Hi,
Is that possible to make telnet deamon under ssh withou any change to
telnet application itself? I have a program running at port 23 and I
want to make sure all communication of it under cypt. For more simplity,
my user now using telnet server:23 to connect the application, can I use
stunnel or openSSH to stunnel the communication to make them run:
ssh server:22 to connect this application? Thanks!
Regards!
Bo
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| Thorbjoern Ravn Andersen 2007-10-23, 7:32 am |
| Bo Yang <struggleyb@gmail.com> writes:
> Hi,
> Is that possible to make telnet deamon under ssh withou any change
> to telnet application itself? I have a program running at port 23 and
> I want to make sure all communication of it under cypt. For more
> simplity, my user now using telnet server:23 to connect the
> application, can I use stunnel or openSSH to stunnel the communication
> to make them run:
> ssh server:22 to connect this application? Thanks!
Your question does not as such make sense.
Telnet protocol is unencrypted, and that is why ssh was invented in
the first place.
If you dislike telnet, you must disable or restrict the daemon.
--
Thorbjørn Ravn Andersen
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| Bo Yang 2007-10-23, 7:32 am |
| Thorbjoern Ravn Andersen :
> Bo Yang <struggleyb@gmail.com> writes:
>
>
> Your question does not as such make sense.
>
> Telnet protocol is unencrypted, and that is why ssh was invented in
> the first place.
>
> If you dislike telnet, you must disable or restrict the daemon.
I am sorry if I did not express my question clearly. I just want a cryt
tunnel with ssh certification mechanism and then redirect the stream to
the application listening on port 23, is that possible?
Thanks!
| |
| Bo Yang 2007-10-23, 7:32 am |
| Thorbjoern Ravn Andersen :
> Bo Yang <struggleyb@gmail.com> writes:
>
>
> Your question does not as such make sense.
>
> Telnet protocol is unencrypted, and that is why ssh was invented in
> the first place.
>
> If you dislike telnet, you must disable or restrict the daemon.
For more detail, the certification should be done by my application, but
I want the whole network stream under SSH, is this possible?
Regards!
Bo
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| Dave Hinz 2007-10-23, 7:32 am |
| On Tue, 23 Oct 2007 16:30:19 +0800, Bo Yang <struggleyb@gmail.com> wrote:
> I am sorry if I did not express my question clearly. I just want a cryt
> tunnel with ssh certification mechanism and then redirect the stream to
> the application listening on port 23, is that possible?
Yes, an Open Source project called stunnel can do this and similar
things. But, the only time I've needed to use it was to support an app
which had already been designed.
The real quesiton is - what are you trying to accomplish? Nearly always
in Unix, if you're trying to do something the hard way, your approach
could be different.
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| Bo Yang 2007-10-23, 1:26 pm |
| Dave Hinz :
> On Tue, 23 Oct 2007 16:30:19 +0800, Bo Yang <struggleyb@gmail.com> wrote:
>
>
> Yes, an Open Source project called stunnel can do this and similar
> things. But, the only time I've needed to use it was to support an app
> which had already been designed.
Yes, my server application was designed serveral years ago and now I
want to add some secure function into it.
If I put stunnel listen on port 2000 and then configure it to redirect
all stream to port 32 where my server is listening. Could you please
tell me that can I use command such as :
ssh server:2000
to access my server. What I am concerning is that the account/password
certification is carried by my server application.
Thanks!
> The real quesiton is - what are you trying to accomplish? Nearly always
> in Unix, if you're trying to do something the hard way, your approach
> could be different.
I am just trying to cryt all the communication between my server and
term client. And my server is a daemon listening on port 23 just like a
telnet deamon. Thanks!
Regards!
Bo
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| Thorbjoern Ravn Andersen 2007-10-23, 1:26 pm |
| Bo Yang <struggleyb@gmail.com> writes:
> I am sorry if I did not express my question clearly. I just want a
> cryt tunnel with ssh certification mechanism and then redirect the
> stream to the application listening on port 23, is that possible?
Look into port forwarding in e.g. ssh.
You then telnet to localhost on a given port and it is transparently
forwarded to the desired destination (which does not have to be on the
ssh server machine).
--
Thorbjørn Ravn Andersen
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| Bo Yang 2007-10-24, 7:31 am |
| On Oct 24, 12:14 am, Thorbjoern Ravn Andersen <nospam0...@gmail.com>
wrote:
> Bo Yang <struggl...@gmail.com> writes:
>
> Look into port forwarding in e.g. ssh.
>
> You then telnet to localhost on a given port and it is transparently
> forwarded to the desired destination (which does not have to be on the
> ssh server machine).
I am sorry, but my client is hard coding to connect to ssh port. I
mean, my client just connect the port 22 to the server using ssh
protocol. I want the clients go to ssh port get the response from the
telnet port. And the Authentication should be played by the
application on port 23. I try stunnel, it did not help. Could you
please tell me how to achieve this?
Regards!
Bo
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| Dave Hinz 2007-10-24, 7:31 am |
| On Wed, 24 Oct 2007 11:09:29 -0000, Bo Yang <struggleyb@gmail.com> wrote:
>
> I am sorry, but my client is hard coding to connect to ssh port. I
> mean, my client just connect the port 22 to the server using ssh
> protocol. I want the clients go to ssh port get the response from the
> telnet port. And the Authentication should be played by the
> application on port 23. I try stunnel, it did not help. Could you
> please tell me how to achieve this?
>
> Regards!
stunnel will do this but, is a rather complicated tool to set up. There
is an stunnel-users mailing list with a good searchable archive which
would be most useful to you on this topic.
Dave Hinz
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| Thorbjoern Ravn Andersen 2007-10-24, 1:33 pm |
| Bo Yang <struggleyb@gmail.com> writes:
> I am sorry, but my client is hard coding to connect to ssh port. I
> mean, my client just connect the port 22 to the server using ssh
> protocol. I want the clients go to ssh port get the response from the
> telnet port. And the Authentication should be played by the
> application on port 23. I try stunnel, it did not help. Could you
> please tell me how to achieve this?
I am afraid I do not fully understand your scenario then.
Sorry, perhaps others can.
--
Thorbjørn Ravn Andersen
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