Re: SELinux Context for web server data files in another part of filesystem?

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On Tue, Nov 19, 2024 at 8:53 PM justina colmena ~biz
<justina@xxxxxxxxxxx> wrote:
>
> On 11/19/24 16:49, Jeffrey Walton wrote:
>
> > But I don't think the answer is an allow rule. I _think_ /var/ftc-data
> > needs to use httpd_sys_content_t, not var_t.
> The "httpd_sys_content_t" selinux context is usually defined in an
> selinux policy module dependency when apache is installed in fedora. I'm
> not sure anything specific has been developed for nginx per se. ymmv,
> whatever selinux policies have been developed and packaged for common
> server software. It's been a while, things are rather outdated now, but
> I believe I've had better luck installing apache and just not using it
> but leaving it installed while running nginx, because the selinux
> policies that have been developed in the past for apache usually "just
> work" with nginx, "httpd_sys_content_t"and everything, although I don't
> know that piggybacking too much software is the "right" solution either.

Yeah, I believe you're right about things just working with Nginx
because of Apache.

I did check things after the initial Nginx install, before any
modifications happened. Here's what I found:

   * default conf file is /etc/nginx/nginx.conf
   * default document root is /usr/share/nginx/html

And:

   # ls -Z /usr/share/nginx/html
   system_u:object_r:httpd_sys_content_t:s0 index.html
   system_u:object_r:httpd_sys_content_t:s0 nginx-logo.png
   ...

I believe "system_u:object_r:httpd_sys_content_t:s0" is the same as
Apache at /var/www/html (and friends). Indeed, when I created
/var/www/html and restorecon'd:

   # ls -Z /var/
   system_u:object_r:httpd_sys_content_t:s0 html
   ...
   # ls -Z /var/www/
   system_u:object_r:httpd_sys_content_t:s0 html

(There's probably a way to list the rules for /var/www(/.*)? (or
whatever that RE syntax is), but I don't know them).

Related, I recently added more topics to Fedora's docs on Nginx at
<https://fedoraproject.org/wiki/Nginx>. It touches on SELinux under
the section File Permissions. Please feel free to make corrections.

Jeff
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