Re: [gentoo-server] Virtual ssh users

Re: [gentoo-server] Virtual ssh users

[Yogesh Sharma]

On 07:43 A. Khattri wrote:
> Incidently, you can use libnss-mysql to avoid having to create an
> actual
> system account if you need "true" virtual users.


Any link to documentation or example for implementing libnss-mysql based
virtual users ?
Database schema, user name, config file etc.


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Re: [gentoo-server] Virtual ssh users

[Paul Kölle]

Yogesh Sharma wrote:
> On 07:43 A. Khattri wrote:
> 
>>Incidently, you can use libnss-mysql to avoid having to create an
>>actual
>>system account if you need "true" virtual users.
> 
> 
> 
> Any link to documentation or example for implementing libnss-mysql based
> virtual users ?
> Database schema, user name, config file etc.
> 
It's pretty straightforward. libnss-mysql configuration file takes a SQL
query for each get*() call, so there are no constraints for the db
schema. Examples are in /usr/share/doc after installing the package.
What I haven't figured out yet: Calls to NSS are made in the context of
the user running e.g. "id", so if you use a socket connection to mysql
you need to allow *every* user to read from the socket. I haven't
investigated the implications in terms of security yet.

cheers
 Paul
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Re: [gentoo-server] Virtual ssh users

[A. Khattri]

On Fri, 9 Sep 2005, Paul Kölle wrote:

> It's pretty straightforward. libnss-mysql configuration file takes a SQL
> query for each get*() call, so there are no constraints for the db
> schema. Examples are in /usr/share/doc after installing the package.
> What I haven't figured out yet: Calls to NSS are made in the context of
> the user running e.g. "id", so if you use a socket connection to mysql
> you need to allow *every* user to read from the socket. I haven't
> investigated the implications in terms of security yet.

If you look at the MySQL privileges for the libnss-mysql user (as set in
/etc/libnss-mysql.cfg) you will see that only SELECT priv is granted for
that user. (Granted, that might be a problem too ;-)


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[gentoo-server] Virtual ssh users

[Yogesh Sharma]

Hi,

Can someone point me to documentation for creating chrooted virtual ssh
only users.

Thanks
YS

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Re: [gentoo-server] Virtual ssh users

[Jeremy Brake]

Me too please. :)

Yogesh Sharma wrote:

>Hi,
>
>Can someone point me to documentation for creating chrooted virtual ssh
>only users.
>
>Thanks
>YS
>
>  
>

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Re: [gentoo-server] Virtual ssh users

[Ben Munat]

This is in portage and I've used it a bit... pretty straightforward.

http://www.jmcresearch.com/projects/jail/

Just remember that *everything* needed by the user has to be in the jail... if you use any 
executable (apache, php, mysql, etc.) outside the jail, it is no longer secure.

b


Yogesh Sharma wrote:
> Hi,
> 
> Can someone point me to documentation for creating chrooted virtual ssh
> only users.
> 
> Thanks
> YS
> 
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Re: [gentoo-server] Virtual ssh users

[ysharma]

Hi,

I am trying to addjailuser with following syntax

addjailuser /home/chroot/jail /home/testys /bin/bash testys

and I am getting error:

addjailuser
A component of Jail (version 1.9 for linux)
http://www.gsyc.inf.uc3m.es/~assman/jail/
Juan M. Casillas <assman@gsyc.inf.uc3m.es>

Adding user testys in chrooted environment /home/chroot/jail
        Error: Can't add the user.
Done.

I already created jail env and added sw also

Any idea ?

Thanks
YS

> This is in portage and I've used it a bit... pretty straightforward.
>
> http://www.jmcresearch.com/projects/jail/
>
> Just remember that *everything* needed by the user has to be in the
> jail... if you use any
> executable (apache, php, mysql, etc.) outside the jail, it is no longer
> secure.
>
> b
>
>
> Yogesh Sharma wrote:
>> Hi,
>>
>> Can someone point me to documentation for creating chrooted virtual ssh
>> only users.
>>
>> Thanks
>> YS
>>
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>
>


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Re: [gentoo-server] Virtual ssh users

[Ben Munat]

Hmm, I haven't messed with jail in a while... Well, did you add the jailed user to the 
regular system with useradd? In other words, there are two steps to adding a jailed user: 
add the user to the regular system with useradd and a shell of /usr/bin/jail and then add 
the user to jail with addjailuser and a shell of /bin/bash. Oh, and the /usr/bin/jail 
shell needs to be in /etc/shells.

If that doesn't help, look around on the jail website and try the mailing list.

good luck,

Ben



ysharma@catprosystems.com wrote:
> Hi,
> 
> I am trying to addjailuser with following syntax
> 
> addjailuser /home/chroot/jail /home/testys /bin/bash testys
> 
> and I am getting error:
> 
> addjailuser
> A component of Jail (version 1.9 for linux)
> http://www.gsyc.inf.uc3m.es/~assman/jail/
> Juan M. Casillas <assman@gsyc.inf.uc3m.es>
> 
> Adding user testys in chrooted environment /home/chroot/jail
>         Error: Can't add the user.
> Done.
> 
> I already created jail env and added sw also
> 
> Any idea ?
> 
> Thanks
> YS
> 
> 
>>This is in portage and I've used it a bit... pretty straightforward.
>>
>>http://www.jmcresearch.com/projects/jail/
>>
>>Just remember that *everything* needed by the user has to be in the
>>jail... if you use any
>>executable (apache, php, mysql, etc.) outside the jail, it is no longer
>>secure.
>>
>>b
>>
>>
>>Yogesh Sharma wrote:
>>
>>>Hi,
>>>
>>>Can someone point me to documentation for creating chrooted virtual ssh
>>>only users.
>>>
>>>Thanks
>>>YS
>>>
>>
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>>
>>
> 
> 
> 
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Re: [gentoo-server] Virtual ssh users

[A. Khattri]

On Tue, 6 Sep 2005, Ben Munat wrote:

> Hmm, I haven't messed with jail in a while... Well, did you add the jailed user to the
> regular system with useradd? In other words, there are two steps to adding a jailed user:
> add the user to the regular system with useradd and a shell of /usr/bin/jail and then add
> the user to jail with addjailuser and a shell of /bin/bash. Oh, and the /usr/bin/jail
> shell needs to be in /etc/shells.

Incidently, you can use libnss-mysql to avoid having to create an actual
system account if you need "true" virtual users.


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