On 03/22/2010 03:14 PM, Andy Warner wrote:
Using FC12, fully updated. I have two basic, but possibly related questions. The first is regarding a change to the targeted policy that resulted in an install error for our Trusted RUBIX policy when using the userdom_unpriv_user_template interface, as off the last targeted policy update. The second are denials I now receive after changing our policy to use a different interface.

First issue:

Our policy had been declaring a custom role (rubix_dbadm_r in this case) using the following:
userdom_unpriv_user_template(rubix_dbadm)
corecmd_exec_shell(
rubix_dbadm_t)

Originally, this worked for its intended purposes with no selinux denials. As of installing policy update:
Name       : selinux-policy-targeted
Arch       : noarch
Version    : 3.6.32
Release    : 103.fc12

When we build our policy we received the following errors:
rubix-dev.te:175: Warning: xserver_user_client() has been deprecated, please use xserver_user_x_domain_template instead.
Installing rubix-dev-targeted policy
libsepol.print_missing_requirements: rubix-dev's global requirements were not met: type/attribute xdrawable_type (No such file or directory).
libsemanage.semanage_link_sandbox: Link packages failed (No such file or directory).
semodule:  Failed!

Looks like a bug in the interface,  You can probably hand edit it, to remove the requirement for xdrawable_type.

I had been receiving the depreciated warning a while (ignoring at my own peril), the link error was new to this targeted policy version. I also received errors while installing selinux-policy-targeted rpm itself, stating a different requirement not being met in the then installed rubix-dev policy. I do not recall the exact error message, but remember it was an X related type that was missing.

Noting the X connection between the depreciated function and the link error, I traced the reference to the depreciated 'xserver_user_client' interface to 'userdom_unpriv_user_template'. I did not call 'xserver_user_client' directly. I replaced the call to 'userdom_unpriv_user_template' with a call to 'userdom_restricted_user_template' and my then policy installed properly.

But using the 'userdom_restricted_user_template ' interface, now I notice some selinux denials during a call to newrole, which is my second question below. I am not sure that the change to the new interface is the cause of the denials, I am just now noticing them.

Should the 'userdom_unpriv_user_template' interface either be fixed or removed from the userdom *.if file?

Second issue:

The rubix_dbadm_r role is now created with:
userdom_restricted_user_template(
rubix_dbadm)
corecmd_exec_shell(
rubix_dbadm_t)

When I perform a newrole, I receive denials as follows (note, I am in permissive mode so the newrole succeeds):

$ id -Z
rxdev_u:staff_r:staff_t:s0-s0:c0.c1023
$ ls -Z `tty`
crw--w----. warner tty rxdev_u:object_r:user_devpts_t:s0 /dev/pts/4
$ newrole -r rubix_dbadm_r
Password:
$

Note: I am a bit surprised that the tty type is
user_devpts_t and not staff_devpts_t, though I am very unfamiliar with this.

Mar 22 11:04:03 localhost setroubleshoot: SELinux is preventing /usr/bin/newrole "write" access on /var/run/dbus/system_bus_socket. For complete SELinux messages. run sealert -l 95fc56ee-8711-460c-874b-6ddb91cc9add
Mar 22 11:04:03 localhost setroubleshoot: SELinux is preventing /usr/bin/newrole "write" access on /var/run/dbus/system_bus_socket. For complete SELinux messages. run sealert -l 95fc56ee-8711-460c-874b-6ddb91cc9add

These look like a bug in policy.  Something in the pam stack is trying to communicate with dbus and newrole is not allowed this access. What do the AVC messages look like.
# more securetty_types
sysadm_tty_device_t
user_tty_device_t
staff_tty_device_t
user_devpts_t
devpts_t
#

Are these denials related to how I create the rubix_dbadm_r role? Is there a proper way to create a role suitable for  auser to transition into and as a potential default logon user role?

I fully admit my choice of creating a role was through observation of other policy code and trail and error. It would be nice to have a definitive word on it.

Thanks,

Andy

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Do you want rubix_dbadm_t to be a full login user or just the domain to run with when you are root?
If you want to allow full use of a desktop but only allow certain privs as root, I would use staff_t and then transition through sudo to rubix_dbadm_t.   Setup an SELinux user that logs in as staff_t and has the staff_r, rubix_dbadm_r and system_r (If he needs to restart services).