Mailing List Archive

On Sat, Mar 17, 2012 at 10:28:59PM +0100, Tom Petri wrote:
> After compiling the policy modules and re-compiling my core packages
> (Gentoo 32bit) I wanted to relabel the filesystem (via rlpkg -a -r)
> but I get these error messages:
>
> > Relabeling filesystem types: btrfs ext2 ext3 ext4 jfs xfs /usr/sbin/setfiles set context /->system_u:object_r:root_t failed:'Operation not supported'
> > /usr/sbin/setfiles set context /boot->system_u:object_r:boot_t failed:'Operation not supported'
> > /usr/sbin/setfiles set context /home->system_u:object_r:home_root_t failed:'Operation not supported'
> > /usr/sbin/setfiles set context /srv->system_u:object_r:var_t failed:'Operation not supported'
> > /usr/sbin/setfiles set context /tmp->system_u:object_r:tmp_t failed:'Operation not supported' /usr/sbin/setfiles set context /usr->system_u:object_r:usr_t failed:'Operation not supported'
> > /usr/sbin/setfiles set context /var->system_u:object_r:var_t failed:'Operation not supported'
> > Scanning for shared libraries with text relocations...
> > 0 libraries with text relocations, 0 not relabeled. Scanning for PIE binaries with text relocations...
> > 0 binaries with text relocations detected.
>
> partitions are /boot, /home, /srv, /tmp, /usr and /var - stored on
> /dev/md1-7, which are formatted using ext4.

Do you have build in support for extended attributes in the kernel (for
these file systems)?

Wkr,
Sven Vermeulen

Yes, extended attributes along with security labels are activated.

# attr -s test -V test /var && attr -r test /var
Attribute "test" set to a 4 byte value for /var: test

I should probably tell how I proceeded during the installation:
1. created the filesystems (as usual)
2. got a hardened stage3 tarball and portage
3. portage sync, re-emerge portage, created a hardened-sources kernel,
booted up.
4. emerge policys (checkpolicy, policycoreutils, selinux-base-policy [-selinux])
5. emerge -uDN world
6. reboot and tried rlpkg -a -r

Cheers

On Sun, Mar 18, 2012 at 9:55 AM, Sven Vermeulen <swift@gentoo.org> wrote:
> On Sat, Mar 17, 2012 at 10:28:59PM +0100, Tom Petri wrote:
>> After compiling the policy modules and re-compiling my core packages
>> (Gentoo 32bit) I wanted to relabel the filesystem (via rlpkg -a -r)
>> but I get these error messages:
>>
>> > Relabeling filesystem types: btrfs ext2 ext3 ext4 jfs xfs /usr/sbin/setfiles set context /->system_u:object_r:root_t failed:'Operation not supported'
>> > /usr/sbin/setfiles set context /boot->system_u:object_r:boot_t failed:'Operation not supported'
>> > /usr/sbin/setfiles set context /home->system_u:object_r:home_root_t failed:'Operation not supported'
>> > /usr/sbin/setfiles set context /srv->system_u:object_r:var_t failed:'Operation not supported'
>> > /usr/sbin/setfiles set context /tmp->system_u:object_r:tmp_t failed:'Operation not supported' /usr/sbin/setfiles set context /usr->system_u:object_r:usr_t failed:'Operation not supported'
>> > /usr/sbin/setfiles set context /var->system_u:object_r:var_t failed:'Operation not supported'
>> > Scanning for shared libraries with text relocations...
>> > 0 libraries with text relocations, 0 not relabeled. Scanning for PIE binaries with text relocations...
>> > 0 binaries with text relocations detected.
>>
>> partitions are /boot, /home, /srv, /tmp, /usr and /var - stored on
>> /dev/md1-7, which are formatted using ext4.
>
> Do you have build in support for extended attributes in the kernel (for
> these file systems)?
>
> Wkr,
>        Sven Vermeulen
>

On Sun, Mar 18, 2012 at 10:36:53AM +0100, Tom Petri wrote:
> Yes, extended attributes along with security labels are activated.
>
> # attr -s test -V test /var && attr -r test /var
> Attribute "test" set to a 4 byte value for /var: test
>
> I should probably tell how I proceeded during the installation:
> 1. created the filesystems (as usual)
> 2. got a hardened stage3 tarball and portage
> 3. portage sync, re-emerge portage, created a hardened-sources kernel,
> booted up.
> 4. emerge policys (checkpolicy, policycoreutils, selinux-base-policy [-selinux])
> 5. emerge -uDN world
> 6. reboot and tried rlpkg -a -r

Did the setfiles commands (mentioned in the installation instructions before
the "rlpkg -a -r") succeed, or did they give the same error?

Wkr,
Sven Vermeulen

On Sun, Mar 18, 2012 at 11:36 AM, Sven Vermeulen <swift@gentoo.org> wrote:
> On Sun, Mar 18, 2012 at 10:36:53AM +0100, Tom Petri wrote:
>> Yes, extended attributes along with security labels are activated.
>>
>> # attr -s test -V test /var && attr -r test /var
>> Attribute "test" set to a 4 byte value for /var: test
>>
>> I should probably tell how I proceeded during the installation:
>> 1. created the filesystems (as usual)
>> 2. got a hardened stage3 tarball and portage
>> 3. portage sync, re-emerge portage, created a hardened-sources kernel,
>> booted up.
>> 4. emerge policys (checkpolicy, policycoreutils, selinux-base-policy [-selinux])
>> 5. emerge -uDN world
>> 6. reboot and tried rlpkg -a -r
>
> Did the setfiles commands (mentioned in the installation instructions before
> the "rlpkg -a -r") succeed, or did they give the same error?
>
> Wkr,
>        Sven Vermeulen
>
>
>
Yes, I got the same errors then:
# setfiles -r /mnt/gentoo
/etc/selinux/strict/contexts/files/file_contexts /mnt/gentoo/dev
setfiles set context /mnt/gentoo/dev->system_u:object_r:device_t
failed:'Operation not supported'
# setfiles -r /mnt/gentoo
/etc/selinux/strict/contexts/files/file_contexts /mnt/gentoo/lib
setfiles set context /mnt/gentoo/lib->system_u:object_r:lib_t
failed:'Operation not supported'

On Sun, Mar 18, 2012 at 12:27 PM, Tom Petri <tom.petri@googlemail.com> wrote:
> On Sun, Mar 18, 2012 at 11:36 AM, Sven Vermeulen <swift@gentoo.org> wrote:
>> On Sun, Mar 18, 2012 at 10:36:53AM +0100, Tom Petri wrote:
>>> Yes, extended attributes along with security labels are activated.
>>>
>>> # attr -s test -V test /var && attr -r test /var
>>> Attribute "test" set to a 4 byte value for /var: test
>>>
>>> I should probably tell how I proceeded during the installation:
>>> 1. created the filesystems (as usual)
>>> 2. got a hardened stage3 tarball and portage
>>> 3. portage sync, re-emerge portage, created a hardened-sources kernel,
>>> booted up.
>>> 4. emerge policys (checkpolicy, policycoreutils, selinux-base-policy [-selinux])
>>> 5. emerge -uDN world
>>> 6. reboot and tried rlpkg -a -r
>>
>> Did the setfiles commands (mentioned in the installation instructions before
>> the "rlpkg -a -r") succeed, or did they give the same error?
>>
>> Wkr,
>>        Sven Vermeulen
>>
>>
>>
> Yes, I got the same errors then:
> # setfiles -r /mnt/gentoo
> /etc/selinux/strict/contexts/files/file_contexts /mnt/gentoo/dev
> setfiles set context /mnt/gentoo/dev->system_u:object_r:device_t
> failed:'Operation not supported'
> # setfiles -r /mnt/gentoo
> /etc/selinux/strict/contexts/files/file_contexts /mnt/gentoo/lib
> setfiles set context /mnt/gentoo/lib->system_u:object_r:lib_t
> failed:'Operation not supported'
I just did a fresh gentoo install (configuration) and proceeded with
the instructions from the gentoo hardened documentation.
After compiling re-emerging world the system doesn't get up. I'm able
to ping it but udev seems to have problems as /dev/console and the
tty's aren't found:

/etc/init.d/sshd[1205]: ERROR: sshd failed to start
/etc/init.d/urandom[1219]: ERROR: urandom failed to start
init: open(/dev/console): No such file or directory
agetty[1233]: /dev/tty2: not a character device
agetty[1232]: /dev/tty1: not a character device

My mdadm RAID is recognized properly, in case it matters.

I did everything the instructions say, however I'm always getting new
errors. Is there a viable solution to this? Thanks in advance!

On Tue, Mar 20, 2012 at 8:32 PM, Tom Petri <tom.petri@googlemail.com> wrote:
> On Sun, Mar 18, 2012 at 12:27 PM, Tom Petri <tom.petri@googlemail.com> wrote:
>> On Sun, Mar 18, 2012 at 11:36 AM, Sven Vermeulen <swift@gentoo.org> wrote:
>>> On Sun, Mar 18, 2012 at 10:36:53AM +0100, Tom Petri wrote:
>>>> Yes, extended attributes along with security labels are activated.
>>>>
>>>> # attr -s test -V test /var && attr -r test /var
>>>> Attribute "test" set to a 4 byte value for /var: test
>>>>
>>>> I should probably tell how I proceeded during the installation:
>>>> 1. created the filesystems (as usual)
>>>> 2. got a hardened stage3 tarball and portage
>>>> 3. portage sync, re-emerge portage, created a hardened-sources kernel,
>>>> booted up.
>>>> 4. emerge policys (checkpolicy, policycoreutils, selinux-base-policy [-selinux])
>>>> 5. emerge -uDN world
>>>> 6. reboot and tried rlpkg -a -r
>>>
>>> Did the setfiles commands (mentioned in the installation instructions before
>>> the "rlpkg -a -r") succeed, or did they give the same error?
>>>
>>> Wkr,
>>>        Sven Vermeulen
>>>
>>>
>>>
>> Yes, I got the same errors then:
>> # setfiles -r /mnt/gentoo
>> /etc/selinux/strict/contexts/files/file_contexts /mnt/gentoo/dev
>> setfiles set context /mnt/gentoo/dev->system_u:object_r:device_t
>> failed:'Operation not supported'
>> # setfiles -r /mnt/gentoo
>> /etc/selinux/strict/contexts/files/file_contexts /mnt/gentoo/lib
>> setfiles set context /mnt/gentoo/lib->system_u:object_r:lib_t
>> failed:'Operation not supported'
> I just did a fresh gentoo install (configuration) and proceeded with
> the instructions from the gentoo hardened documentation.
> After compiling re-emerging world the system doesn't get up. I'm able
> to ping it but udev seems to have problems as /dev/console and the
> tty's aren't found:
>
> /etc/init.d/sshd[1205]: ERROR: sshd failed to start
> /etc/init.d/urandom[1219]: ERROR: urandom failed to start
> init: open(/dev/console): No such file or directory
> agetty[1233]: /dev/tty2: not a character device
> agetty[1232]: /dev/tty1: not a character device
>
> My mdadm RAID is recognized properly, in case it matters.
>
> I did everything the instructions say, however I'm always getting new
> errors. Is there a viable solution to this? Thanks in advance!
The udev from the hardened documentation seems to be the problem (udev
/dev tmpfs rw,rootcontext=system_u:object_r:device_t,seclabel,nosuid,relatime,size=10m,mode=755
0 0).

The systems boots without this entry, however `sestatus` says "disabled".

On Wed, Mar 21, 2012 at 04:40:32PM +0100, Tom Petri wrote:
> > I just did a fresh gentoo install (configuration) and proceeded with
> > the instructions from the gentoo hardened documentation.
> > After compiling re-emerging world the system doesn't get up. I'm able
> > to ping it but udev seems to have problems as /dev/console and the
> > tty's aren't found:
> >
> > /etc/init.d/sshd[1205]: ERROR: sshd failed to start
> > /etc/init.d/urandom[1219]: ERROR: urandom failed to start
> > init: open(/dev/console): No such file or directory
> > agetty[1233]: /dev/tty2: not a character device
> > agetty[1232]: /dev/tty1: not a character device
> >
> > My mdadm RAID is recognized properly, in case it matters.

You aren't by any chance using an initramfs, are you?

> The udev from the hardened documentation seems to be the problem (udev
> /dev tmpfs rw,rootcontext=system_u:object_r:device_t,seclabel,nosuid,relatime,size=10m,mode=755
> 0 0).
>
> The systems boots without this entry, however `sestatus` says "disabled".

Is SELinux indeed disabled, or does it only "look" like so?

An easy way to test is when you run in strict policy (or mcs/mls without
unconfined domains) and you're in the sysadm_t domain. Then try reading
/etc/shadow:

hpl ~ # id
uid=0(root) gid=0(root)
groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy),20(dialout),26(tape),27(video)
context=staff_u:sysadm_r:sysadm_t

hpl ~ # cat /etc/shadow
cat: /etc/shadow: Permission denied

Wkr,
Sven Vermeulen