selinux problems connecting with a chroot user to a RHEL6 system

[Garey Mills]

Hello -

I am experiencing the following problem with Selinux on a RHEL6
system:

I am trying to set up a chrooted user. I edited sshd_config to
contain the lines

Match User physics
           ChrootDirectory /chrootAccounts/physics
          X11Forwarding no
          AllowTcpForwarding no

I created a user named 'physics' with the home directory of
/chrootAccounts/physics and constructed a chroot jail consisting of the
directory /chrootAccounts and the requisite bin, dev and lib directories.

If I disable selinux, I can log in.

I enabled selinux and then tried to log in. This generated a 
number of 'avc' errors
which I dealt with using 'audit2allow' utility. At the end of this
process I ended up with the following error message that will not clear:

Apr 22 15:10:44 srblib3 kernel: type=1400 audit(1366668644.309:100143):
avc:  denied  { transition } for pid=4852 comm="sshd" path="/bin/sh"
dev=sda3 ino=524299
scontext=system_u:system_r:chroot_user_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tclass=process

Trying to solve this by going to Google, I found that this problem (that
'chroot_user_t' cannot 'transition' to the sh process) had been solved
and patches submitted on a Debian Selinux list, but apparently not in
RHEL6.

Does anyone know a solution to this that could be applied by
someone who knows how to use audit2allow but not much else about Selinux?

[Miroslav Grepl]

On 04/26/2013 12:41 AM, Garey Mills wrote:
> Hello -
>   I am experiencing the following problem with Selinux on a RHEL6
>
> system:
>   I am trying to set up a chrooted user. I edited sshd_config to
>
> contain the lines
>
> Match User physics
>           ChrootDirectory /chrootAccounts/physics
>          X11Forwarding no
>          AllowTcpForwarding no
>
> I created a user named 'physics' with the home directory of
> /chrootAccounts/physics and constructed a chroot jail consisting of the
> directory /chrootAccounts and the requisite bin, dev and lib directories.
>
> If I disable selinux, I can log in.
>   I enabled selinux and then tried to log in. This generated a 
>
> number of 'avc' errors
> which I dealt with using 'audit2allow' utility. At the end of this
> process I ended up with the following error message that will not clear:
>
> Apr 22 15:10:44 srblib3 kernel: type=1400 audit(1366668644.309:100143):
> avc:  denied  { transition } for pid=4852 comm="sshd" path="/bin/sh"
> dev=sda3 ino=524299
> scontext=system_u:system_r:chroot_user_t:s0-s0:c0.c1023
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> tclass=process
>
> Trying to solve this by going to Google, I found that this problem (that
> 'chroot_user_t' cannot 'transition' to the sh process) had been solved
> and patches submitted on a Debian Selinux list, but apparently not in
> RHEL6.
>   Does anyone know a solution to this that could be applied by
>
> someone who knows how to use audit2allow but not much else about Selinux?

rpm -q selinux-policy openssh