Re: [MLS Policy]:- MLS policy enforcing mode problem when manully restart the system services.
On Wed, 2008-06-11 at 20:32 +0530, prakash hallalli wrote:
HI ALL
I have configured SELinux on ContOS 5.1. I have configured the RBAC
using MLS (Multilevel Security) Policy using enforcing mode. I am
trying to restart the system services and they are not restarting and
it is throwing some error message.
Steps to reproduce:
1 ) MLS Policy configuration.
1. Install selinux-policy-mls
2. Set SELINUXTYPE=MLS in /etc/selinux/config file
3. touch ./autorelabel; on root's home directory, and reboot the
machine.
As others noted, this should have been touch /.autorelabel, not
touch ./autorelabel on root's home directory. But I don't think that is
relevant any more - you already manually relabeled.
4. While machine is rebooting, change the GRUB parameter.
enforcing=0
2) Now system is in permissive mode and SELinux status is as follows.
[root@turtle11 ~]# sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: permissive
Mode from config file: enforcing
Policy version: 21
Policy from config file: mls
3) Restart the system services and they restart successfully.
[root@turtle11 ~]# service nfs restart
Shutting down NFS mountd: [ OK ]
Shutting down NFS daemon: [ OK ]
Shutting down NFS quotas: [ OK ]
Shutting down NFS services: [ OK ]
Starting NFS services: [
OK ]
Starting NFS quotas: [
OK ]
Starting NFS daemon: [ OK ]
Starting NFS mountd: [ OK ]
3) Now i am setting enforcing mode using setenforce command.
root@turtle11 ~]#setenforce 1
root@turtle11 ~]# sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: enforcing
Mode from config file: enforcing
Policy version: 21
Policy from config file: mls
4) a) Now system is in enforcing mode and i am trying to restart the
system service. The restart will result in error message.
[root@turtle11 ~]# service nfs restart
nfs: unrecognized service
[root@turtle11 ~]# run_init /etc/init.d/nfs restart
Authenticating root.
Password: XXXXXX
run_init: incorrect password for root
authentication failed.
[root@turtle11 ~]#
[root@turtle11 ~]# run_init /etc/init.d/ldap restart
Authenticating root.
Password: XXXXXX
run_init: incorrect password for root
authentication failed.
This implies that the existing policy isn't allowing these domains to do
what they need to perform the authentication. Elsewhere you said you
are using ldap, so they may need additional permissions for the network
lookup.
5) I am using sysadm_r
[root@turtle11 ~]# id
uid=0(root) gid=0(root)
groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
context=root:sysadm_r:sysadm_t:SystemLow-SystemHigh
[root@turtle11 ~]#
6) This is i am getting /sbin/ausearch log messages.
[root@turtle11 ~]#/sbin/ausearch -i -m AVC -sv no
type=SYSCALL msg=audit(06/11/2008 20:01:29.285:130367) : arch=x86_64
syscall=recvfrom success=no exit=-13(Permission denied) a0=5
a1=7fff60825b40 a2=5dc a3=0 items=0 ppid=1 pid=3103 auid=root uid=root
gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root
tty=(none) comm=dhcpd exe=/usr/sbin/dhcpd
subj=root:sysadm_r:sysadm_t:s0-s15:c0.c1023 key=(null)
type=AVC msg=audit(06/11/2008 20:01:29.285:130367) : avc: denied
{ read } for pid=3103 comm=dhcpd lport=1
scontext=root:sysadm_r:sysadm_t:s0-s15:c0.c1023
tcontext=root:sysadm_r:sysadm_t:s0-s15:c0.c1023 tclass=rawip_socket
On this one, as I said, dhcpd shouldn't be running in sysadm_t.
How did you start it?
--
Stephen Smalley
National Security Agency