shellinabox

[lejeczek]

hi guys,

cannot get it to work - shellinabox - not being programmer nor selinux 
sorcerer.

shellinabox via apache, when I ausearch it all I get is:

#============= unconfined_service_t ==============

#!!!! The file '/usr/bin/bash' is mislabeled on your system.
#!!!! Fix with $ restorecon -R -v /usr/bin/bash
allow unconfined_service_t unconfined_t:process transition;

I have shellinabox in Apache's:

<Location /cmd>
   AuthType Basic
   AuthName "some more"
   AuthBasicProvider PAM
   AuthPAMService rstudio
   Require valid-user
   #Require    all granted
   ProxyPass  http://localhost:4200/
</Location>

using:

LoadModule authnz_pam_module modules/mod_authnz_pam.so

So all seems to work there between apache & shellinabox. Last bit when 
you login to shell you get denied.

Would there be a reasonable selinux module for it or is shellinabox just 
too poor design?

many thanks, L.

[Paul Howarth]

On Mon, 11 Jun 2018 18:25:08 +0100
lejeczek <peljasz(a)yahoo.co.uk&gt; wrote:

>  hi guys,
>  
>  cannot get it to work - shellinabox - not being programmer nor
>  selinux sorcerer.
>  
>  shellinabox via apache, when I ausearch it all I get is:
>  
>  #============= unconfined_service_t ==============
>  
>  #!!!! The file '/usr/bin/bash' is mislabeled on your system.
>  #!!!! Fix with $ restorecon -R -v /usr/bin/bash
>  allow unconfined_service_t unconfined_t:process transition;
>  
>  I have shellinabox in Apache's:
>  
>  <Location /cmd>
>     AuthType Basic
>     AuthName "some more"
>     AuthBasicProvider PAM
>     AuthPAMService rstudio
>     Require valid-user
>     #Require    all granted
>     ProxyPass  http://localhost:4200/
>  </Location>
>  
>  using:
>  
>  LoadModule authnz_pam_module modules/mod_authnz_pam.so
>  
>  So all seems to work there between apache & shellinabox. Last bit
>  when you login to shell you get denied.
>  
>  Would there be a reasonable selinux module for it or is shellinabox
>  just too poor design? 
Strange. shellinabox is working for me on Fedora 27.

What's the context of /usr/bin/bash on your system?

$ ls -lZ /usr/bin/bash
-rwxr-xr-x. 1 root root system_u:object_r:shell_exec_t:s0 1132656 Feb
13 14:08 /usr/bin/bash

If it's not shell_exec_t, the advice given in the error message you saw
should fix it.

Paul.

[Jean-David Beyer]

On 06/12/2018 04:02 AM, Paul Howarth wrote:
>  ls -lZ /usr/bin/bash
>  -rwxr-xr-x. 1 root root system_u:object_r:shell_exec_t:s0 1132656 Feb
>  13 14:08 /usr/bin/bash 

I do not have a problem, but just for laughs, I tried the above.
Red Hat Enterprise Linux Server release 6.9 (Santiago)
$ uname -r
2.6.32-696.30.1.el6.x86_64

$ ls -lZ /usr/bin/bash
ls: cannot access /usr/bin/bash: No such file or directory
$ whereis bash
bash: /bin/bash /usr/share/man/man1/bash.1.gz
$ ls -lZ /bin/bash
-rwxr-xr-x. root root system_u:object_r:shell_exec_t:s0 /bin/bash
$ ls -l /bin/bash
-rwxr-xr-x. 1 root root 942200 Feb 15  2017 /bin/bash


-- 
  .~.  Jean-David Beyer          Registered Linux User 85642.
  /V\  PGP-Key:166D840A 0C610C8B Registered Machine  1935521.
 /( )\ Shrewsbury, New Jersey    http://linuxcounter.net
 ^^-^^ 06:50:01 up 21 days, 11:33, 2 users, load average: 4.47, 4.71, 4.49

[lejeczek]

On 12/06/18 09:02, Paul Howarth wrote:
>  On Mon, 11 Jun 2018 18:25:08 +0100
>  lejeczek <peljasz(a)yahoo.co.uk&gt; wrote:
>  
> > hi guys,
> >
> > cannot get it to work - shellinabox - not being programmer nor
> > selinux sorcerer.
> >
> > shellinabox via apache, when I ausearch it all I get is:
> >
> > #============= unconfined_service_t ==============
> >
> > #!!!! The file '/usr/bin/bash' is mislabeled on your system.
> > #!!!! Fix with $ restorecon -R -v /usr/bin/bash
> > allow unconfined_service_t unconfined_t:process transition;
> >
> > I have shellinabox in Apache's:
> >
> > <Location /cmd>
> >     AuthType Basic
> >     AuthName "some more"
> >     AuthBasicProvider PAM
> >     AuthPAMService rstudio
> >     Require valid-user
> >     #Require    all granted
> >     ProxyPass  http://localhost:4200/
> > </Location>
> >
> > using:
> >
> > LoadModule authnz_pam_module modules/mod_authnz_pam.so
> >
> > So all seems to work there between apache & shellinabox. Last bit
> > when you login to shell you get denied.
> >
> > Would there be a reasonable selinux module for it or is shellinabox
> > just too poor design?
>  
>  Strange. shellinabox is working for me on Fedora 27.
>  
>  What's the context of /usr/bin/bash on your system?
>  
>  $ ls -lZ /usr/bin/bash
>  -rwxr-xr-x. 1 root root system_u:object_r:shell_exec_t:s0 1132656 Feb
>  13 14:08 /usr/bin/bash
>  
>  If it's not shell_exec_t, the advice given in the error message you saw
>  should fix it.
>  
>  Paul.
>  _______________________________________________ 
I should have maybe mentioned that I'm on Centos 7.5

$ ll -Z /usr/bin/bash
-rwxr-xr-x. root root system_u:object_r:shell_exec_t:s0 /usr/bin/bash
$ ll -Z /usr/sbin/shellinaboxd
-rwxr-xr-x. root root system_u:object_r:bin_t:s0 
/usr/sbin/shellinaboxd
☩ WHALE 49 ~]$ ll -Z /usr/bin/bash

I think problems is here, it's how systemd does the service:
$ ps -FZp 2909167 --cols 999
LABEL                           UID          PID    PPID  C    SZ   RSS 
PSR STIME TTY          TIME CMD
system_u:system_r:unconfined_service_t:s0 shellin+ 2909167 1  0 10785 
2740 7 Jun11 ?       00:00:00 /usr/sbin/shellinaboxd -u shellinabox -g 
shellinabox --cert=/var/lib/shellinabox --port=4200 --localhost-only 
--disable-ssl

[lejeczek]

Anybody on Centos 7.5?

Is it really healthy to:

allow unconfined_service_t unconfined_t:process transition;

?

>  On 06/12/2018 04:02 AM, Paul Howarth wrote:
> > ls -lZ /usr/bin/bash
> > -rwxr-xr-x. 1 root root system_u:object_r:shell_exec_t:s0 1132656 Feb
> > 13 14:08 /usr/bin/bash
>
>  I do not have a problem, but just for laughs, I tried the above.
>  Red Hat Enterprise Linux Server release 6.9 (Santiago)
>  $ uname -r
>  2.6.32-696.30.1.el6.x86_64
>
>  $ ls -lZ /usr/bin/bash
>  ls: cannot access /usr/bin/bash: No such file or directory
>  $ whereis bash
>  bash: /bin/bash /usr/share/man/man1/bash.1.gz
>  $ ls -lZ /bin/bash
>  -rwxr-xr-x. root root system_u:object_r:shell_exec_t:s0 /bin/bash
>  $ ls -l /bin/bash
>  -rwxr-xr-x. 1 root root 942200 Feb 15  2017 /bin/bash
>
>