Re: [meta-selinux][PATCH 0/4] add targeted/minimum policy and some updates

[Pascal Ouyang <xin.ouyang@windriver.com>]

于 14-4-4 上午3:20, Joe MacDonald 写道:
> Hey Wenzong,
>
> I merged two of these four.
>
> [[yocto] [meta-selinux][PATCH 0/4] add targeted/minimum policy and some updates] On 14.03.24 (Mon 21:07) wenzong.fan@windriver.com wrote:
>
>> From: Wenzong Fan <wenzong.fan@windriver.com>
>>
>> Changes:
>> * backport tmpfs_t patch from upstream;
>> * add rules for /var/log symlink on poky;
>
> These both went in.  These:
>
>> * add targeted policy type
>> * add minimum targeted policy
>
> I'm less clear on.  They both look like significant changes to
> refpolicy-* behaviour, which is fine, but in that case I think it'd be
> better to give them a different name.  Or one that differentiates them
> significantly.  For example the "minimum" policy has users unconfined
> and applications confined?  Or neither?  I'm not sure what the value is
> of these.
>
> If they really are just specialized versions of the standard reference
> policy, they should at least be ported to use the refpolicy_common
> infrastructure Phil set up a while back.

Hi Joe&Wenzong,

According to the origin design, both policy types are targeted policies.

For targeted policies,
* Users will login into shells on unconfined domain.
* For applications with no policy module or with policy module disabled, 
they will also run on unconfined domain.
* For applications "targeted", they would have policy module enabled, 
with rules to do domtrans from unconfined/init* domain to their own domain.

The result will be:
- standard/mls :
   un-ruled applications(usually bin_t) will run on unconfined domain, 
so operations will *not* be blocked.
- targeted/minimum
   un-ruled applications will run on user's current domain, such as 
user_t,sysadm_t, so most privileged operations will be blocked.


Difference between refpolicy-minium&refpolicy-targeted
* refpolicy-minium = targeted policy with only core policies
   It should just be used for admins to defined their own policy.
   For example, a httpd server could just use refpolicy-minium + httpd 
module. Actually, I have thought to use refpolicy-targeted-minium as its 
name, but not in the end.
* refpolicy-targeted = targeted policy with all 300+ modules

Thanks. :)

- Pascal

>
> Thanks,
> -J.
>
>>
>> The following changes since commit a6079a43719e79e12a57e609923a0cccdba06916:
>>
>>    refpolicy: fix real path for su.shadow (2014-02-13 10:52:07 -0500)
>>
>> are available in the git repository at:
>>
>>    git://git.pokylinux.org/poky-contrib wenzong/ref-minimum
>>    http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=wenzong/ref-minimum
>>
>> Wenzong Fan (4):
>>    refpolicy: associate tmpfs_t (shm) to device_t (devtmpfs) file
>>      systems
>>    refpolicy: add rules for /var/log symlink on poky
>>    refpolicy: add targeted policy type
>>    refpolicy: add minimum targeted policy
>>
>>   ...associate-tmpfs_t-shm-to-device_t-devtmpf.patch |   30 +++
>>   ...ky-policy-add-rules-for-syslogd_t-symlink.patch |   30 +++
>>   ...rules-for-var-log-symlink-audisp_remote_t.patch |   29 +++
>>   .../refpolicy/refpolicy-minimum_2.20130424.bb      |   46 +++++
>>   ...olicy-fix-optional-issue-on-sysadm-module.patch |   60 ++++++
>>   .../refpolicy-unconfined_u-default-user.patch      |  198 ++++++++++++++++++++
>>   .../refpolicy/refpolicy-targeted_2.20130424.bb     |   18 ++
>>   .../refpolicy/refpolicy_2.20130424.inc             |    3 +
>>   8 files changed, 414 insertions(+)
>>   create mode 100644 recipes-security/refpolicy/refpolicy-2.20130424/filesystem-associate-tmpfs_t-shm-to-device_t-devtmpf.patch
>>   create mode 100644 recipes-security/refpolicy/refpolicy-2.20130424/poky-policy-add-rules-for-syslogd_t-symlink.patch
>>   create mode 100644 recipes-security/refpolicy/refpolicy-2.20130424/poky-policy-add-rules-for-var-log-symlink-audisp_remote_t.patch
>>   create mode 100644 recipes-security/refpolicy/refpolicy-minimum_2.20130424.bb
>>   create mode 100644 recipes-security/refpolicy/refpolicy-targeted/refpolicy-fix-optional-issue-on-sysadm-module.patch
>>   create mode 100644 recipes-security/refpolicy/refpolicy-targeted/refpolicy-unconfined_u-default-user.patch
>>   create mode 100644 recipes-security/refpolicy/refpolicy-targeted_2.20130424.bb
>>


-- 
- Pascal