chroot SSH users.

[Marwan Sultan]

Dear Krad,

 Thank you for your reply, regarding your answer, i have few questions here

 

1-

 in sshd_config file the default line is :

 Subsystem       sftp    /usr/libexec/sftp-server

 

 So should i comment out the line? or just add your line ?

 Subsystem sftp internal-sftp


2- the SSH is the default one that comes with FreeBSD, I ofcourse didnot compile

    SSH in the system. Are you asking me to install additional packages?

    or to recompile ssh when you wrote :

    "Make sure chroot support was compiled in"

 

3- SSH users are using passwords not keygen, where do i get the keys for thier

   login? 

 

 Thank you

 

- Marwan


> >
> > Hello people,

> > Im on FreeBSD 7.2-R P5
> >
> > Its easy to chroot ftp users - adding users to /etc/ftpchroot -makes the
> > job easy.
> >
> > How about if I want to chroot the SSH users (not ftp)
> >
> > any easy way? no need for jail installation or anything like this..
>> > I saw sshd_config file and it has a chrootdirectory but not sure how to
> > use it..
> > Anyone? any tips? any easy way?
> > Thank you
> > -Marwan
> >
> > _________________________________________________________________
> > Hotmail: Free, trusted and rich email service.
> >
> > 

> 
> fairly easy if you read the man page 8) I wrote this howto for sun boxes at
> work but it was using openssh so same rules should apply. Make sure chroot
> support was compiled in though
> 
> 
> 1. Dont bother with sun ssh it wont work. Opensolaris and later solaris
> 10 are bundled with openssh though.
> 2. Make sure openssh version is 5 or above (some 4s do work but 5 better)
> 3. Add these lines to sshd config
> 
> Match Group sftponly
> ChrootDirectory /home/chroot/%u
> X11Forwarding no
> AllowTcpForwarding no
> ForceCommand internal-sftp
> 
> 4. Make sure the Subsystem line is this
> 
> Subsystem sftp internal-sftp
> 
> 5. create the sftponly group on the system
> 6. put the relevent users in this group. be careful as you will stop them
> being able to ssh in!!
> 7. Dead important this bit !!!
> 
> mkdir -p /home/chroot/<user>/home/<user>/.ssh
> chown -R root /home/chroot/<user>
> chown -R <user> /home/chroot/<user>
> chmod -R 755 /home/chroot/<user> /home/chroot/<user>/home/<user>
> ln -s /home/chroot/<user>/home/<user> /home/.
> 
> 8. Put their ssh keys in /home/chroot/<user>/home/<user>/.ssh
> 
> All should now work
> 
> If not check /etc/shadow the account might be locked, this just caught me
> out :)
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