[newbie] SELinux and the /srv directory
Paul Howarth
paul at city-fan.org
Tue Aug 16 09:10:12 UTC 2005
Razvan Sandu wrote:
> Hello,
>
> Could you please help me solve the following matter regarding SELinux ?
>
> For a project I have in my enterprise, I put some files under the /srv
> directory (let's call it "/srv/project" - it includes a lot of
> subdirectories too).
>
> I did so because I learned from the FHS that this is the correct place
> where I should put the files a server will serve (?)
>
> I want these files available to some Unix group, read/write in common
> for the users in that group. *They must be accesible through Samba as
> well as through FTP*.
>
> Now when I do a touch /.autorelabel; reboot, SELinux marks files in
> /srv/project as system_u,object_r,var_t and users get a "permission
> denied" when accesing them (at least via Samba). To solve that, I
> manually changed to system_u,object_r,home_user_t, but this is less than
> optimal.
>
>
> Would you please tell me the following:
>
> - is /srv/project the correct (canonical) place to keep these common
> read/write work files or should I put them to /var/ftp/pub or other place ?
Yes, it's the right place.
> - what is the proper context such files should have ? Of course, I don't
> want this context automatically modified each time I do an automatic
> relabeling...
The current policy allows for this if you use the type ftpd_anon_rw_t
for this data. There are then a set of booleans you can use to specify
which daemons can write to this data:
allow_ftpd_anon_write
allow_httpd_anon_write
allow_httpd_sys_script_anon_write
allow_rsync_anon_write
allow_smbd_anon_write
So if you want to be able to write to these files using FTP and Samba, use:
# setsebool -P allow_ftpd_anon_write 1
# setsebool -P allow_smbd_anon_write 1
> - are specific policy rules/types necessary for the /srv directory
> content ?
Yes; /srv is pretty well free-format so there are no predefined rules
for it.
Try creating /etc/selinux/targeted/contexts/files/file_contexts.local
with the following entry:
/srv/project(/.*)? system_u:object_r:ftpd_anon_rw_t
> I think this should be of interest for many people - it's a
> configuration for a standard fileserver...
That's what I thought too; until recently this facility wasn't available.
Paul.
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