Re: Please help me in resolving this issue

[Daniel J Walsh <dwalsh@xxxxxxxxxx>]

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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>>
>>
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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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