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Re: [dsdp-tm-dev] RLogin Shell Service
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Hi,
After two days of testing the exec() method, I don't think it's possible to communicate with the rlogind server, though the redirection of the standard input and output work well (I can run a bash and get all the commands output). The problem is, from what i've read on the internet, the entrance of the rlogin password does not use the standard input (for security reason), but a sort of pseudo-terminal.
Florian
2009/6/2 Oberhuber, Martin
<Martin.Oberhuber@xxxxxxxxxxxxx>
Hi,
this comment has more links to related
bugs.
Cheers,
--
Martin Oberhuber, Senior Member of Technical
Staff, Wind River
Target Management Project
Lead, DSDP PMC Member
Sent: Montag, 01. Juni 2009 15:05
To: Target
Management developer discussions
Subject: Re: [dsdp-tm-dev] RLogin
Shell Service
Hello,
Thank you for answering that fast, that's more than
appreciable.
I'm sorry to say I didn't find the bugzilla entry, but I've
decided to investigate the "Runtime.exec()" way. From what I could read, it
allows the programmer to launch any external application, and to redirect the
input,output and error streams to the Java application.
As I'm not sure to
be on the right path, don't hesitate if you think that's not the right
mechanism to use. What intrigues me is that many sites related to
Runtime.exec() mentions the fact that this can't be used as a shell, therefore
user interaction doesn't seem to be possible. To be more precise, I haven't
been able to test it yet, but using exec("rlogin") and redirecting the streams
shouldn't be sufficient enough to make it work properly. Maybe running
exec("/usr/bin/bash -c rlogin") could do it... I'm far from being a Java
expert, so I'd just like to hear your advices and ideas on this
solution.
Thanks for the attention,
Florian
2009/5/30 Oberhuber, Martin
<Martin.Oberhuber@xxxxxxxxxxxxx>
Ah,
yes... now I remember :)
rlogin
works from java only if the super-user (root) runs the Java
program.
For
normal users, all you can do is launch the operating system's rlogin
executable.
That
executable is built with setuid bit so it will run with root
privileges.
We've
been doing this commercially, so I know it's doable and I don't think there
is any other way around it.
On
Windows, I'm not quite sure ... the privileged ports below 1024 may be
accessible on Windows, you'd need to try it out or google the web if there
is a chance for this to work. Otherwise, you need an rlogin.exe on
Windows.
BTW, if
you write your program to launch the external rlogin exe and communicate
through it, this has more advantages: your solution becomes very flexible,
since users can replace rlogin.exe by any other exe they like. We've had
existing requests to do this for ssh (i.e. use external ssh.exe) because
such external ssh programs support more configuration options than internal
Java ssh client. There should be a related bug in bugzilla (something about
ssh config, I'm sure you find it when running bugzilla
search).
Cheers,
--
Martin Oberhuber, Senior Member of Technical Staff,
Wind River
Target Management
Project Lead, DSDP PMC Member
Hi everybody,
I'm currently working on an RLogin shell
service, adapting the work done for telnet.
I'm facing a major problem
: for security reasons, when a user wants to access a remote system, the
"source port" for the rlogin command must be in the range 0-1023. As i'm
accessing it through Eclipse, this condition is not respected and the
authentification failed miserably ("java.net.BindException: All ports in
use or insufficient permssion").
Do I have to modify the Apache Commons
Net sources to bypass this restriction (dirty) or is there a another
solution ?
Thank you for your
attention
Florian
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