This is the update I have made based on suggestions for the previous
patches to add a udev_run interface. This adds the new domain udevadm_t
which is entered from /usr/bin/udevadm.
It seems to meet the needs that I have, but there are some things to
note that are probably important.
1) There are a few systemd services that use udevadm during startup.
I have granted the permisssions that I need based on denials I was
seeing during startup (the machine would fail to start without the
permisions).
2) In the udev.fc file there are other binaries that I don't have on a
RHEL7 box that maybe should also be labeled udevadm_exec_t.
e.g. /usr/bin/udevinfo and /usr/bin/udevsend
But as I don't have those binaries to test, I have not updated the
type of that binary.
3) There are some places that call udev_domtrans that maybe should now
be using udevadm_domtrans - rpm.te, hal.te, hotplug.te. Again,
these are not things that I am using in my current situation and am
unable to test the interactions to know if the change is correct.
Other than that, I think this was a good suggestion to split udevadm
into a different domain.
Only change for v4 is to use stream_connect_pattern as suggested.
Signed-off-by: Dave Sugar <dsugar@tresys.com>
On systems such as Arch Linux, all programs which are usually located in
/bin, /sbin, /usr/bin and /usr/sbin are present in /usr/bin and the
other locations are symbolic links to this directory. With such a
configuration, the file contexts which define types for files in
/bin, /sbin and /usr/sbin need to be duplicated to provide definitions
for /usr/bin/...
As the "/bin vs. /usr/bin" part of the needed definitions has already
been done with the "usr merge" patches, the next step consists in
duplicating file contexts for /usr/sbin. This is what this patch does
for all modules which are not in contrib.
This is the second iteration of an idea I have previously posted on
http://oss.tresys.com/pipermail/refpolicy/2017-March/009176.html
Some policy modules define file contexts in /bin, /sbin and /lib without
defining similar file contexts in the same directory under /usr.
Add these missing file contexts when there are outside ifdef blocks.
Remove file context aliases and update file context paths to use the /run filesystem path.
Add backward compatibility file context alias for /var/run using applications like https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783321
Lock files are still seated at /var/lock
VBoxCreateUSBNode.sh creates character special files in /dev/vboxusb each time
a new USB device appears. This script is called by udev.
audit.log on a system in permissive mode before this patch contains:
type=AVC msg=audit(1396889711.890:175): avc: denied { execute } for pid=26284 comm="systemd-udevd" name="VBoxCreateUSBNode.sh" dev="sda5" ino=5899405 scontext=system_u:system_r:udev_t tcontext=unconfined_u:object_r:usr_t tclass=file
type=AVC msg=audit(1396889711.890:175): avc: denied { execute_no_trans } for pid=26284 comm="systemd-udevd" path="/usr/share/virtualbox/VBoxCreateUSBNode.sh" dev="sda5" ino=5899405 scontext=system_u:system_r:udev_t tcontext=unconfined_u:object_r:usr_t tclass=file
udevadm wants to create files in /run/udev/data. It writes to udev_tbl_t
directories
udev_t runs udisks-lvm-pv-export with a domain transition to lvm_t
udev: remove compromise_kernel capability2 av perm as its currently not
supported in reference policy
udev: udevadm managing udev_tbl_t symbolic links (/run/udev/watch/6)
udev: udevd manages control udev_tbl_t type socket
udev: udevd manages udev_tbl_t directories
named files pid filetrans for /run/udev directory
udev: lets just label /run/udev type udev_var_run_t and get it over with
udev: make the files_pid_filetrans more specific because it appears that
udev also creates directories in /run that we dont want to have created
with type udev_var_run_t (/run/avahi-daemon in Debian)
udev: udev-acl.ck uses dbus system bus fds
udev: sends dbus message to consolekit manager:
OpenSessionWithParameters
Signed-off-by: Dominick Grift <dominick.grift@gmail.com>
Recent udev installs its main binary in /usr/lib/systemd (called systemd-udevd).
Update file contexts to support this.
Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>
This is intended to label /run/udev, but I am assuming that everyone
will use file_contexts.subs(_dist)? to substitute /var/run for /run,
since there are currently no other fcs for /run in refpolicy.
The label is udev_tbl_t instead of udev_var_run_t, because /run/udev
contains the data which used to be in /dev/.udev.
I realized the policy wasn't complete for handling udev_tbl_t dirs, and
updating it wouldn't work because we couldn't make a filetrans on dirs,
since all the dirs in /dev would become udev_tbl_t. i.e. this would have
been required, but would make problems: dev_filetrans(udev_t, udev_tbl_t, dir);
udev_var_run_t is used for managing files in /etc/udev/rules.d as well as other files, including udev pid files. This patch creates a type specifically for rules.d files, and an interface for managing them. It also gives access to this type to initrc_t so that rules can be properly populated during startup. This also fixes a problem on Gentoo where udev rules are NOT properly populated on startup.
Signed-off-by: Chris Richards <gizmo@giz-works.com>
Signed-off-by: Chris PeBenito <cpebenito@tresys.com>
Sugar, David
Nicolas Iooss
Chris PeBenito
cgzones
Dominick Grift
Chris PeBenito
Sven Vermeulen
Dominick Grift
Chris Richards