Re: SELinux, httpd and TWiki in FC3
On Thu, Nov 11, 2004 at 11:40:07AM -0500, Daniel J Walsh wrote:
Jared W. Robinson wrote:
>First, I wanted to disable SELinux for just Apache, which is supposed
>to be possible. I ran "system-config-securitylevel", selected the
>"SELinux" tab, and opened the "transition" list, and selected
>"Disable Selinux protection for httpd daemon", , clicked "ok",
then
>restarted httpd. Unfortunately, this didn't work.
What didn't work? What went wrong? Do you have any AVC Messages?
I'm assuming that when I selected to disable the protection for httpd,
and I select "OK" on the dialog (in system-config-securitylevel), then
httpd would run as if it weren't being restricted by SELinux anymore.
But, I still got the same AVC denied messages as before I tried to
disable it.
>Third, I started enforcing SELinux policy again, and I made sure
I set
>the types appropriately for the cgi scripts and for the files the
>scripts read/write to using
>chcon -t httpd_user_script_exec_t <cgi_scripts>
>chcon -t httpd_sys_content_t <content files and directories>
You might want to change this to
chcon -t httpd_sys_script_rw_t <content files and directories>
Which would eliminate a lot of AVC messages from below.
httpd_sys_content_t should only be for static content.
Thanks; I've now changed them.
>Here's my local.te file that seems to work so far:
>allow httpd_sys_script_t sysctl_kernel_t:dir { search };
>allow httpd_sys_script_t sysctl_kernel_t:file { read };
>allow httpd_sys_script_t sysctl_t:dir { search };
What is asking for these?
Good question. I'm assuming that it's something from one of the TWiki cgi
scripts.
>allow httpd_sys_script_t tmp_t:lnk_file { read };
/usr/tmp?
Don't know. It might be nice if the AVC messages gave full paths -- but
I guess SELinux works with objects, not paths, right?
>allow httpd_sys_script_t httpd_sys_content_t:dir { read };
>allow httpd_sys_script_t httpd_sys_content_t:file { append };
>allow httpd_sys_script_t httpd_sys_content_t:dir { write };
>allow httpd_sys_script_t httpd_sys_content_t:file { write };
>allow httpd_sys_script_t httpd_sys_content_t:dir { add_name };
>allow httpd_sys_script_t httpd_sys_content_t:file { create };
>allow httpd_sys_script_t httpd_sys_content_t:file { setattr };
>allow httpd_sys_script_t httpd_sys_content_t:dir { remove_name };
>allow httpd_sys_script_t httpd_sys_content_t:file { rename };
>allow httpd_sys_script_t httpd_sys_content_t:file { unlink };
>
Changing httpd_sys_content_t to httpd_sys_script_rw_t would fix most of
these?
I tried that, and turned off httpd_unified (I think), and now I get this:
Nov 11 10:56:08 myhost kernel: audit(1100195768.763:0): avc: denied { execute } for
pid=24886 exe=/usr/sbin/httpd name=view dev=dm-1 ino=1329201
scontext=root:system_r:httpd_t tcontext=user_u:object_r:httpd_sys_content_t tclass=file
What should I do about that? The "view" cgi script has
user_u:object_r:httpd_sys_script_exec_t as the type.
What is the settings of httpd_unified?
If httpd_unified correlates with the similiar named setting in
system-config-securitylevel, then it is enabled (except when I turned it off for my test
above).
I think I prefer to run with httpd_unified, and the local.te policy that I already have,
simply because it works.
- Jared