Re: Please help me in resolving this issue

[Daniel J Walsh <dwalsh@xxxxxxxxxx>]

Looking at Fedora policy I see

sesearch -T -t login_exec_t
Found 4 semantic te rules:
   type_transition rlogind_t login_exec_t : process remote_login_t;
   type_transition telnetd_t login_exec_t : process remote_login_t;
   type_transition getty_t login_exec_t : process local_login_t;
   type_transition kmscon_t login_exec_t : process local_login_t;

Which means only getty_t and kmscon_t transition to local_login_t

Then looking at getty_exec_t I see.

 sesearch -T -t getty_exec_t
Found 8 semantic te rules:
   type_transition kdumpctl_t getty_exec_t : process getty_t;
   type_transition piranha_pulse_t getty_exec_t : process getty_t;
   type_transition initrc_t getty_exec_t : process getty_t;
   type_transition condor_startd_t getty_exec_t : process getty_t;
   type_transition glusterd_t getty_exec_t : process getty_t;
   type_transition openshift_initrc_t getty_exec_t : process getty_t;
   type_transition init_t getty_exec_t : process getty_t;
   type_transition cluster_t getty_exec_t : process getty_t;


Which shows init_t transitioning to getty_t via getty_exec_t

# grep getty_exec_t /etc/selinux/targeted/contexts/files/file_contexts
/sbin/.*getty    --    system_u:object_r:getty_exec_t:s0
/usr/sbin/.*getty    --    system_u:object_r:getty_exec_t:s0

So on fedora the init system executes /usr/sbin/.*getty which should transition to getty_t.

We are obviously not seeing this on your platform.

On 08/24/2015 08:09 AM, Srinivasa Rao Ragolu wrote:

Hi Daniel,

See the contexts of init scripts

*******************************************

root@arm-cortex-a15:~# ls -Z /etc/rc5.d/

system_u:object_r:etc_t:s0 S02dbus-1

system_u:object_r:etc_t:s0 S02sssd

system_u:object_r:etc_t:s0 S20distcc

system_u:object_r:etc_t:s0 S20hwclock.sh

system_u:object_r:etc_t:s0 S20nslcd

system_u:object_r:etc_t:s0 S20syslog

system_u:object_r:etc_t:s0 S21avahi-daemon

system_u:object_r:etc_t:s0 S99rmnologin.sh

system_u:object_r:etc_t:s0 S99stop-bootlogd

root@arm-cortex-a15:~# ls -Z /etc/init.d

      system_u:object_r:initrc_exec_t:s0 0selinux-init

      system_u:object_r:initrc_exec_t:s0 alignment.sh

system_u:object_r:avahi_initrc_exec_t:s0 avahi-daemon

      system_u:object_r:initrc_exec_t:s0 banner.sh

      system_u:object_r:initrc_exec_t:s0 bootlogd

      system_u:object_r:initrc_exec_t:s0 bootmisc.sh

      system_u:object_r:initrc_exec_t:s0 checkroot.sh

      system_u:object_r:initrc_exec_t:s0 dbus-1

      system_u:object_r:initrc_exec_t:s0 devpts.sh

      system_u:object_r:initrc_exec_t:s0 distcc

              system_u:object_r:etc_t:s0 functions

      system_u:object_r:initrc_exec_t:s0 functions.initscripts

      system_u:object_r:initrc_exec_t:s0 functions.lsbinitscripts

      system_u:object_r:initrc_exec_t:s0 halt

      system_u:object_r:initrc_exec_t:s0 hostname.sh

      system_u:object_r:initrc_exec_t:s0 hwclock.sh

************************************************************************

/etc/inittab file l0:0:wait:/etc/init.d/rc 0   

*******************************************  

# /etc/inittab: init(8) configuration.                         

# $Id: inittab,v 1.91 2002/01/25 13:35:21 miquels Exp $        

                                                               

# The default runlevel.                                        

id:5:initdefault:                                              

                                                               

# Boot-time system configuration/initialization script.        

# This is run first except when booting in emergency (-b) mode.

si::sysinit:/etc/init.d/rcS                           

                                                      

# What to do in single-user mode.                     

~~:S:wait:/sbin/sulogin                               

                                                      

# /etc/init.d executes the S and K scripts upon change

# of runlevel.                 

#                              

# Runlevel 0 is halt.          

# Runlevel 1 is single-user.   

# Runlevels 2-5 are multi-user.

# Runlevel 6 is reboot.                       

l1:1:wait:/etc/init.d/rc 1     

l2:2:wait:/etc/init.d/rc 2     

l3:3:wait:/etc/init.d/rc 3     

l4:4:wait:/etc/init.d/rc 4     

l5:5:wait:/etc/init.d/rc 5     

l6:6:wait:/etc/init.d/rc 6

# Normally not reached, but fallthrough in case of emergency.

z6:6:respawn:/sbin/sulogin                                   

con:2345:respawn:/sbin/getty console 

********************************************

I am not pretty sure which version of policy it is using, but from built recipes. But referred yocto link and provided you version.

How this issue of labelling can be resolved?

Thanks,

Srinivas.

On Mon, Aug 24, 2015 at 4:34 PM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:

Ok so this is using your own policy.  Using system v init usually meant you went from init_t @ initrc_exec_t -> initrc_t @ mydomain_exec_t -> mydomain_t

You usually did not transition from the init system directly to the final domain.  

Are your init script labeled initrc_exec_t?

On 08/24/2015 05:15 AM, Srinivasa Rao Ragolu wrote:

Hi Daniel,

Sure. Sorry for late repoly. I am sharing details now.

As I am using embedded platform, so referring yocto bitbake recipes for building selinux layer. (ie: http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux/tree/recipes-security/selinux)

Policy is targeted/enforcing. version is 2.3.

root@arm-cortex-a15:~# rpm -qa | grep selinux

packagegroup-selinux-policycoreutils-lic-1.0-r0.cortexa15hf_vfp

packagegroup-core-selinux-lic-1.0-r0.cortexa15hf_vfp

selinux-config-lic-0.1-r4.arm_cortex_a15

libselinux-lic-2.3-r0.cortexa15hf_vfp

selinux-config-0.1-r4.arm_cortex_a15

libselinux-2.3-r0.cortexa15hf_vfp

libselinux-bin-2.3-r0.cortexa15hf_vfp

libselinux-python-2.3-r0.cortexa15hf_vfp

pam-plugin-selinux-1.1.6-r2.4.2.cortexa15hf_vfp

system-config-selinux-2.3-r0.cortexa15hf_vfp

packagegroup-selinux-policycoreutils-1.0-r0.cortexa15hf_vfp

packagegroup-core-selinux-1.0-r0.cortexa15hf_vfp

I am using sysvinit. every daemon is running on its own context. Please see attached rootfs log.

Thanks and Regards,

Srinivas.

On Fri, Aug 21, 2015 at 12:49 AM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:

On 08/19/2015 11:51 PM, Srinivasa Rao Ragolu wrote:

Hi All,

Please find the security contexts of necessary files

root@arm-cortex-a15:~# sestatus -v

SELinux status:                 enabled

SELinuxfs mount:                /sys/fs/selinux

SELinux root directory:         /etc/selinux

Loaded policy name:             targeted

Current mode:                   permissive

Mode from config file:          permissive

Policy MLS status:              enabled

Policy deny_unknown status:     allowed

Max kernel policy version:      28

Process contexts:

Current context:                unconfined_u:unconfined_r:unconfined_t:s0

Init context:                   system_u:system_r:init_t:s0

File contexts:

Controlling terminal:           unconfined_u:object_r:user_tty_device_t:s0

/etc/passwd                     system_u:object_r:etc_t:s0

/etc/shadow                     system_u:object_r:shadow_t:s0

/bin/bash                       system_u:object_r:shell_exec_t:s0

/bin/login                      system_u:object_r:bin_t:s0 -> system_u:object_r:login_exec_t:s0

/bin/sh                         system_u:object_r:bin_t:s0 -> system_u:object_r:shell_exec_t:s0

/sbin/init                      system_u:object_r:bin_t:s0 -> system_u:object_r:init_exec_t:s0

/lib/libc.so.6                  system_u:object_r:lib_t:s0 -> system_u:object_r:lib_t:s0

Do I need to change any of the file contexts to avoid the issue of login failure?

The problem is the login program is not transitioning from init_t to local_login_t. 

You never answered the question about what version of selinux-policy

rpm -q selinux-policy

Is this system using systemd?

Are other programs running in different context beside kernel_t and init_t?

Thanks,

Srinivas.

On Wed, Aug 19, 2015 at 6:05 PM, Srinivasa Rao Ragolu <sragolu@xxxxxxxxxx> wrote:

As I could not able to login, changed /etc/selinux/config from enforcing to permissive. Executed above commands.

On Wed, Aug 19, 2015 at 6:04 PM, Srinivasa Rao Ragolu <sragolu@xxxxxxxxxx> wrote:

Hi Daniel,

Please see the output of security contexts. Also no usr is mounted.

root@arm-cortex-a15:~# ls -lZ /bin/login*

lrwxrwxrwx. 1 root root system_u:object_r:bin_t:s0           17 Aug 18 15:06 /bin/login -> /bin/login.shadow

-rwxr-xr-x. 1 root root system_u:object_r:login_exec_t:s0 31756 Aug 12 07:18 /bin/login.shadow

root@arm-cortex-a15:~# mount

/dev/root on / type ext2 (rw,relatime,seclabel)

sysfs on /sys type sysfs (rw,relatime,seclabel)

selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)

proc on /proc type proc (rw,relatime)

none on /dev type devtmpfs (rw,relatime,seclabel,size=514956k,nr_inodes=128739,mode=755)

devpts on /dev/pts type devpts (rw,relatime,seclabel,gid=5,mode=620,ptmxmode=000)

tmpfs on /var/volatile type tmpfs (rw,relatime,seclabel)

tmpfs on /media/ram type tmpfs (rw,relatime,seclabel)

please guide if you find an clue from above output

Thanks,

Srinivas.

On Wed, Aug 19, 2015 at 12:38 AM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:

ls -lZ /usr/bin/login*

By any chance is the /usr directory mounted NOSUID?

On 08/18/2015 07:58 AM, Srinivasa Rao Ragolu wrote:

Hi,

I am building for embedded platform. Could not able to get exact version. But can provide info about recipe in yocto.

http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux/tree/recipes-security/refpolicy/

http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux/tree/recipes-security/refpolicy/refpolicy-targeted_git.bb

Any pointers please?

Thanks,

Srinivas.

On Tue, Aug 18, 2015 at 8:17 PM, Miroslav Grepl <mgrepl@xxxxxxxxxx> wrote:

On 08/18/2015 04:37 PM, Srinivasa Rao Ragolu wrote:
> Hi Daniel,
>
> I have checked the file_contexts file
>
> * #grep :login_exec_t contexts/files/file_contexts*
> /bin/login--system_u:object_r:login_exec_t:s0
> /bin/login\.shadow--system_u:object_r:login_exec_t:s0
> /bin/login\.tinylogin--system_u:object_r:login_exec_t:s0
> /usr/kerberos/sbin/login\.krb5--system_u:object_r:login_exec_t:s0
>
> Now If I run with permissive mode. I Could see below login programs are
> running
> (Here I gave unconfined_r as role and s0 as range)
>
> * 1109 root      3540 S    /bin/login --*
> * 1111 root         0 SW   [kauditd]*
> * 1113 root      3020 S    -sh*
> *
> *
> But when I run with enforcing mode I get same error
>
> /*arm-cortex-a15 login: root*/
> /*Last login: Tue Aug 18 11:36:58 UTC 2015 on console*/
> /*Would you like to enter a security context? [N]  Y*/
> /*role: unconfined_r*/
> /*level: s0*/
> /*[ 1252.885468] type=1400 audit(1439898856.140:13): avc:  denied  {
> transition } for  pid=1120 comm="login" path="/bin/bash" dev="mmcblk0"
> ino=58115 scontext=system_u:system_r:init_t:s0
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0 tclass=process*/
> /*[ 1252.887219] type=1400 audit(1439898856.140:14): avc:  denied  {
> transition } for  pid=1120 comm="login" path="/bin/bash" dev="mmcblk0"
> ino=58115 scontext=system_u:system_r:init_t:s0
> tcontext=unconfined_u:unconfined_r:unconfined_t:s0 tclass=process*/
> /*Cannot execute /bin/sh: Permission denied*/
> /*
> */
> /*MontaVista Carrier Grade Linux 7.0.0 arm-cortex-a15 /dev/console*/
> /*
> */
> /*arm-cortex-a15 login:*/
> /*
> */
> /*
> */
> /Please guide me what is going wrong and how to resolve this issue./
> /
> /
> /Thanks,/
> /Srinivas./
>
> On Tue, Aug 18, 2015 at 6:52 PM, Daniel J Walsh <dwalsh@xxxxxxxxxx
> <mailto:dwalsh@xxxxxxxxxx>> wrote:
>
>     What is the path to the login program?  What is it labeled?  The
>     problem is login is running with the wrong context.
>
>     It should be labeled login_exec_t
>
>     grep :login_exec_t /etc/selinux/targeted/contexts/files/file_contexts
>     /bin/login    --    system_u:object_r:login_exec_t:s0
>     /usr/bin/login    --    system_u:object_r:login_exec_t:s0
>     /usr/kerberos/sbin/login\.krb5    --
>     system_u:object_r:login_exec_t:s0
>
>
>     init_t is supposed to transition to local_login_t when executing the
>     login program.
>
>
>     On 08/18/2015 06:17 AM, Srinivasa Rao Ragolu wrote:
>>     Hi Daniel,
>>
>>     Thanks for quick reply. Please find first time boot log with
>>     lableling and reboot.
>>
>>     Also find second time boot log when I created /.autorelablel.
>>
>>     Somehow I could not able to login as root.
>>
>>     Your help is really appriciated.
>>
>>     Thanks,
>>     Srinivas.
>>
>>     On Tue, Aug 18, 2015 at 6:16 PM, Daniel J Walsh <dwalsh@xxxxxxxxxx
>>     <mailto:dwalsh@xxxxxxxxxx>> wrote:
>>
>>         Looks like you have a labeling issue.
>>
>>         touch /.autorelabel; reboot
>>
>>         Should fix the issues.
>>
>>
>>
>>         On 08/18/2015 04:53 AM, Srinivasa Rao Ragolu wrote:
>>>         Hi All,
>>>
>>>         I have very new to selinux. Today I have ported selinux to my
>>>         embedded platform with targeted policy+enforcing.
>>>
>>>         When I try to boot, it completes labeling filesystem. But I
>>>         could not able to login using root.. See my error log...
>>>
>>>         /*arm-cortex-a15 login: root*/
>>>         /*Last login: Tue Aug 18 11:36:58 UTC 2015 on console*/
>>>         /*Would you like to enter a security context? [N]  Y*/
>>>         /*role: unconfined_r*/
>>>         /*level: s0*/
>>>         /*[ 1252.885468] type=1400 audit(1439898856.140:13): avc:
>>>          denied  { transition } for  pid=1120 comm="login"
>>>         path="/bin/bash" dev="mmcblk0" ino=58115
>>>         scontext=system_u:system_r:init_t:s0
>>>         tcontext=unconfined_u:unconfined_r:unconfined_t:s0
>>>         tclass=process*/
>>>         /*[ 1252.887219] type=1400 audit(1439898856.140:14): avc:
>>>          denied  { transition } for  pid=1120 comm="login"
>>>         path="/bin/bash" dev="mmcblk0" ino=58115
>>>         scontext=system_u:system_r:init_t:s0
>>>         tcontext=unconfined_u:unconfined_r:unconfined_t:s0
>>>         tclass=process*/
>>>         /*Cannot execute /bin/sh: Permission denied*/
>>>         /*
>>>         */
>>>         /*MontaVista Carrier Grade Linux 7.0.0 arm-cortex-a15
>>>         /dev/console*/
>>>         /*
>>>         */
>>>         /*arm-cortex-a15 login:*/
>>>         /*
>>>         */
>>>         Please help me.. How can I solve this issue and achieve
>>>         normal boot.
>>>
>>>
>>>         Thanks,
>>>         Srinivas.
>>>
>>>
>>>         --
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>>>         selinux@xxxxxxxxxxxxxxxxxxxxxxx
>>>         <mailto:selinux@xxxxxxxxxxxxxxxxxxxxxxx>
>>>         https://admin.fedoraproject.org/mailman/listinfo/selinux
>>
>>
>>
>>
>>     --
>>     selinux mailing list
>>     selinux@xxxxxxxxxxxxxxxxxxxxxxx
>>     <mailto:selinux@xxxxxxxxxxxxxxxxxxxxxxx>
>>     https://admin.fedoraproject.org/mailman/listinfo/selinux
>
>
>
>
> --
> selinux mailing list
> selinux@xxxxxxxxxxxxxxxxxxxxxxx
> https://admin.fedoraproject.org/mailman/listinfo/selinux
>

What does

$ rpm -q selinux-policy-targeted

?

Also could you try to reinstall the selinux-policy-targeted to see if it
blows up?

--
Miroslav Grepl
Senior Software Engineer, SELinux Solutions
Red Hat, Inc.

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