Re: [Ltib] FTP/TELNET on LPC3250 with linux-2.6.27.8, not working

[Stuart Hughes]

Hi Kevin/Fernando,

One final thing to point out (which is probably obvious).  From a
security point of view, telnet is not advisable outside a purely
test/insecure development environment.

The reason is that usernames/passwords are sent across the network in
clear text and can easily be sniffed (that's why normally securetty
doesn't allow any root access unless you're on the platform itself).

Anyhow, if possible use ssh (dropbear), it's small, simpler to setup and
secure.

Regards, Stuart

Kevin Wells wrote:
> Hi Fernando, Hi Stuart,
> 
> One more item to take a look at...
> 
> The 3250 configurations have telnetd setup in Busybox by default.
> Bring up the LTIB config menu and go into the package List-->
> menu and enable the [*] Configure busybox at build time option.
> Exit the menu and the busybox config menu should appear soon.
> 
> Go to the Busybox Network Utilities---> menu and verify the
> [*] telnetd option is checked. Also select <help> on this option
> to see the requirements in the kernel and elsewhere in busybox
> to use telnetd.
> 
> Also enable the [*] Use the devpts filesystem for Unix98 PTYs
> option (CONFIG_FEATURE_DEVPTS) in the
> Busybox settings--->General configuration---> menu.
> 
> I think this is all you need to make this work. I didn't have to
> make changes to any startup scripts or anything else..
> 
>> Although this can/should be made to work (I have used it), you could use
>> dropbear instead, this would allow you to ssh into the box instead of
>> telnet.
> 
> Yes, I've been asked a few times for this support to be default,
> so I'll look at adding dropbear and the necessary config changes
> to the 31xx and 32xx platforms on our next update.
> 
> thanks,
> Kevin
> 
>> -----Original Message-----
>> From: address@hidden [mailto:ltib-
>> address@hidden On Behalf Of Stuart Hughes
>> Sent: Wednesday, February 17, 2010 10:04 AM
>> To: Fernando Vilmar Palha
>> Cc: address@hidden
>> Subject: Re: [Ltib] FTP/TELNET on LPC3250 with linux-2.6.27.8, not working
>>
>> Hi Fernando,
>>
>> * Where are you trying to telnet from, what is the command (please cut
>> and paste)
>>
>> * Which telnet are you using (it could come from busybox or inetutils).
>> Check when you run ./ltib -m config
>>
>> * Can you send me your config/platform/ea3250/defconfig.dev file (or
>> whatever the platform is).
>>
>> Although this can/should be made to work (I have used it), you could use
>> dropbear instead, this would allow you to ssh into the box instead of
>> telnet.
>>
>> Regards, Stuart
>>
>>
>> Fernando Vilmar Palha wrote:
>>> Hi Stuart,
>>>
>>> I added the entries in /etc/securetty, but nothing changed.
>>>
>>> */etc/securetty*
>>> address@hidden /]# cat /etc/securetty
>>> console
>> [snip]
>>> tts/0
>>> tts/1
>>> *pts/0
>>> pts/1*
>>>
>> [snip]
>>>> It's probably an because the terminal you're connecting from is not in
>>>> /etc/securetty
>>>>
>> [snip]
>>>>>> I'm starting the development with LPC3250 and I'm running
>>>>>> linux-2.6.27.8 on EA LPC3250 board, but I can not do Telnet/FTP to
>> the
>>>>>> board.
>>>>>>
>>>>>> Just Telnet by serial port is possible.
>>>>>>
>> *ftp     stream  tcp     nowait  root    /usr/sbin/vsftpd        vsftpd
>> telnet  stream  tcp     nowait  root    /usr/sbin/telnetd       telnetd*
>>
>>
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>