Modern systems shouldn't need direct access to raw memory
devices (/dev/mem, /dev/kmem, /dev/mergemem, dev/oldmem, /dev/port)
anymore, so let's remove the access in most cases and make it tunable
in the rest.
Add dev_read_raw_memory_cond(), dev_write_raw_memory_cond() and
dev_wx_raw_memory_cond(), which are conditional to new boolean
allow_raw_memory_access.
Remove raw memory access for a few domains that should never have
needed it (colord_t, iscsid_t, mdamd_t, txtstat_t), should not need it
anymore (dmidecode_t, Debian devicekit_diskt_t, hald_t, hald_mac_t,
xserver_t) or the domains that should transition to different domain
for this (rpm_t, kudzu_t, dpkg_t).
Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
Systemd has ConditionPath.*, ConditionFile.* and ConditionDir* which
are used to check various path/file/directory to control starting a
service. But this requires getattr permissions on the types.
Example denials that fit the problem.
The first example is from lvm where accessing config file.
type=AVC msg=audit(1575427946.229:1624): avc: denied { getattr } for
pid=1 comm="systemd" path="/etc/lvm/lvm.conf" dev="dm-0" ino=51799
scontext=system_u:system_r:init_t:s0
tcontext=system_u:object_r:lvm_etc_t:s0 tclass=file permissive=0
This second example is from chronyd, but it is happening becuase I added
the conditional in a drop-in file.
type=AVC msg=audit(1575427959.882:1901): avc: denied { getattr } for
pid=1 comm="systemd" path="/etc/chrony.conf" dev="dm-0" ino=53824
scontext=system_u:system_r:init_t:s0
tcontext=system_u:object_r:chronyd_conf_t:s0 tclass=file permissive=1
v3 - rework to not use interface and allow getattr for all files
Signed-off-by: Dave Sugar <dsugar@tresys.com>
Add interface similar to files_mountpoint() and add a conditional which
allows mount on non_security_file_type.
Signed-off-by: Chris PeBenito <chpebeni@linux.microsoft.com>
Remove unused permission definitions from SELinux.
Many of these were only ever used in pre-mainline
versions of SELinux, prior to Linux 2.6.0. Some of them
were used in the legacy network or compat_net=1 checks
that were disabled by default in Linux 2.6.18 and
fully removed in Linux 2.6.30.
The corresponding classmap declarations were removed from the
mainline kernel in:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=42a9699a9fa179c0054ea3cf5ad3cc67104a6162
Permissions never used in mainline Linux:
file swapon
filesystem transition
tcp_socket { connectto newconn acceptfrom }
node enforce_dest
unix_stream_socket { newconn acceptfrom }
Legacy network checks, removed in 2.6.30:
socket { recv_msg send_msg }
node { tcp_recv tcp_send udp_recv udp_send rawip_recv rawip_send dccp_recv dccp_send }
netif { tcp_recv tcp_send udp_recv udp_send rawip_recv rawip_send dccp_recv dccp_send }
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
This patch is based on comments from previous a patch to
remove the many uses of kernel_dgram_send() and incorporate
it into logging_send_syslog_msg().
v2 - enclose in ifdef for redhat
v3 - rebase this patch on e41def136a
Signed-off-by: Dave Sugar <dsugar@tresys.com>
init (systemd) needs to read /etc/hostname during boot
to retreive the hostname to apply to the system.
Feb 06 18:37:06 localhost.localdomain kernel: type=1400 audit(1549478223.842:3): avc: denied { read } for pid=1 comm="systemd" name="hostname" dev="dm-1" ino=1262975 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:net_conf_t:s0 tclass=file permissive=0
Signed-off-by: Dave Sugar <dsugar@tresys.com>
systemd-update-done needs to be able to create /etc/.updated and /var/.updated
Jun 6 13:11:58 localhost systemd-update-done: Failed to create timestamp file /etc/.updated: Permission denied
Jun 6 13:11:58 localhost systemd-update-done: Failed to create timestamp file /var/.updated: Permission denied
Jun 6 13:11:58 localhost systemd: systemd-update-done.service: main process exited, code=exited, status=1/FAILURE
Jun 6 13:11:58 localhost systemd: Failed to start Update is Completed.
Jun 6 13:11:58 localhost systemd: Unit systemd-update-done.service entered failed state.
Jun 6 13:11:58 localhost systemd: systemd-update-done.service failed.
Signed-off-by: Dave Sugar <dsugar@tresys.com>
Topi Miettinen
Chris PeBenito
Sugar, David
Chris PeBenito
Stephen Smalley
Nicolas Iooss
Alexander Miroshnichenko
Chris PeBenito
Russell Coker
Jason Zaman