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On 06/23/2011 11:36 PM, Daniel B. Thurman wrote:
> Almost worked! I had to add to do:
>
> But I ran into a tough nut to crack, setroubleshooter was complaining:
>
> + SELinux is preventing /usr/sbin/httpd from using potentially
> mislabeled files last_jpeg.
> + SELinux is preventing /usr/sbin/httpd from using potentially
> mislabeled files event.
>
> These files are located in: /dev/shm/kmotion_ramdisk areas, so I added:
>
> semanage fcontext -a -t httpd_sys_content_rw_t
> "/dev/shm/kmotion_ramdisk(/.*)?"
> restorecon -R -v -F /dev/shm/kmotion_ramdisk/
>
> and yet, the odd-ball here is that all the files in this directory shows
> context as:
>
> restorecon reset /dev/shm/kmotion_ramdisk/01/last_jpeg context
> system_u:object_r:httpd_sys_rw_content_t:s0->system_u:object_r:device_t:s0
Yes those two types are aliased buth have the same properties. i never
understand why they did that.
> restorecon reset /dev/shm/kmotion_ramdisk/events context
> system_u:object_r:httpd_sys_rw_content_t:s0->system_u:object_r:device_t:s0
>
> Look carefully ==> _rw_ <== is put into the wrong position!
>
> I could test this using chcon and the results are the same.
>
> Something is preventing me from properly labelling the files in
> /dev/shm/kmotion_ramdisk area since _rw_ is put after 'sys'
> instead of after 'content'!
>
> I tried:
>
> chcon -R -t httpd_sys_content_rw_t /dev/shm/kmotion_ramdisk (_rw_ is in
> the wrong position)
>
> I also tried to see if I get a different result as if _rw_ would be swapped:
>
> chcon -R -t httpd_sys_rw_content_t /dev/shm/kmotion_ramdisk (_rw_ is
> still in the wrong position)
>
>
> How do I fix this?
I dont see a need to fix that since those types are aliased.
You have another issue here though.
/dev//shm is a tmpfs meaning each time you boot it will be cleared.
i do not think that httpd_t is allowed to create files in /dev/shm by
default.
So you would in that case need to allow httpd_t to create files (and
directories) there. To do that properly you would probably need to
create a type owned by apache, and allow apache to type transition in
tmpfs_t directories.
example:
myapache.te
policy_module(myapache, 1.0.0)
gen_require(` type httpd_t; ')
type httpd_tmpfs_t;
files_tmpfs_file(httpd_tmpfs_t)
manage_dirs_pattern(httpd_t, httpd_tmpfs_t, httpd_tmpfs_t)
manage_files_pattern(httpd_t, httpd_tmpfs_t, httpd_tmpfs_t)
fs_tmpfs_filetrans(httpd_t, httpd_tmpfs_t, { dir file })
then:
make -f /usr/share/selinux/devel/Makefile myapache.pp
sudo semodule myapache.pp
service httpd stop
rm -rf /dev/shm/kmotion_ramdisk
service httpd start
If you would implement that policy then httpd_t would be allowed to
create dirs and files in /dev/shm and it would create them with type
httpd_tmpfs_t automatically.
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