#DESC LVM - Linux Volume Manager
#
# Author:  Michael Kaufman <walker@screwage.com>
# X-Debian-Packages: lvm10 lvm2 lvm-common
#

#################################
#
# Rules for the lvm_t domain.
#
# lvm_t is the domain for LVM administration.
# lvm_exec_t is the type of the corresponding programs.
# lvm_etc_t is for read-only LVM configuration files.
# lvm_metadata_t is the type of LVM metadata files in /etc that are
# modified at runtime.
#
type lvm_vg_t, file_type, sysadmfile;
type lvm_metadata_t, file_type, sysadmfile;
type lvm_control_t, device_type, dev_fs;
etcdir_domain(lvm)
allow lvm_t var_t:dir search;
lock_domain(lvm)
allow lvm_t lvm_lock_t:dir rw_dir_perms;

# needs privowner because it assigns the identity system_u to device nodes
# but runs as the identity of the sysadmin
daemon_base_domain(lvm, `, fs_domain, privowner')
role sysadm_r types lvm_t;
domain_auto_trans(sysadm_t, lvm_exec_t, lvm_t)

# LVM will complain a lot if it cannot set its priority.
allow lvm_t self:process setsched;

allow lvm_t self:fifo_file rw_file_perms;
allow lvm_t self:unix_dgram_socket create_socket_perms;

r_dir_file(lvm_t, proc_t)
allow lvm_t self:file r_file_perms;

# Read system variables in /proc/sys
read_sysctl(lvm_t)

# Read /sys/block. Device mapper metadata is kept there.
r_dir_file(lvm_t, sysfs_t) 

allow lvm_t fs_t:filesystem getattr;

# Read configuration files in /etc.
allow lvm_t { etc_t etc_runtime_t }:file { getattr read };

# LVM creates block devices in /dev/mapper or /dev/<vg>
# depending on its version
file_type_auto_trans(lvm_t, device_t, fixed_disk_device_t, blk_file)

# LVM(2) needs to create directores (/dev/mapper, /dev/<vg>)
# and links from /dev/<vg> to /dev/mapper/<vg>-<lv>
allow lvm_t device_t:dir create_dir_perms;
allow lvm_t device_t:lnk_file create_lnk_perms;

# /lib/lvm-<version> holds the actual LVM binaries (and symlinks)
allow lvm_t lvm_exec_t:dir search;
allow lvm_t lvm_exec_t:{ file lnk_file } r_file_perms;

tmp_domain(lvm)
allow lvm_t { random_device_t urandom_device_t }:chr_file { getattr read ioctl };

# DAC overrides and mknod for modifying /dev entries (vgmknodes)
allow lvm_t self:capability { dac_override ipc_lock sys_admin sys_nice mknod };

# Write to /etc/lvm, /etc/lvmtab, /etc/lvmtab.d
file_type_auto_trans(lvm_t, { etc_t lvm_etc_t }, lvm_metadata_t, file)

allow lvm_t lvm_metadata_t:dir rw_dir_perms;

# Inherit and use descriptors from init.
allow lvm_t init_t:fd use;

# LVM is split into many individual binaries
can_exec(lvm_t, lvm_exec_t)

# Access raw devices and old /dev/lvm (c 109,0).  Is this needed?
allow lvm_t fixed_disk_device_t:chr_file create_file_perms;

# relabel devices
allow lvm_t { default_context_t file_context_t }:dir search;
allow lvm_t file_context_t:file { getattr read };
can_getsecurity(lvm_t)
allow lvm_t fixed_disk_device_t:blk_file { relabelfrom relabelto };
allow lvm_t device_t:lnk_file { relabelfrom relabelto };

# Access terminals.
allow lvm_t { initrc_devpts_t admin_tty_type }:chr_file rw_file_perms;
allow lvm_t devtty_t:chr_file rw_file_perms;
ifdef(`gnome-pty-helper.te', `allow lvm_t sysadm_gph_t:fd use;')
allow lvm_t privfd:fd use;
allow lvm_t devpts_t:dir { search getattr read };

read_locale(lvm_t)

# LVM (vgscan) scans for devices by stating every file in /dev and applying a regex...
dontaudit lvm_t device_type:{ chr_file blk_file } getattr;
dontaudit lvm_t ttyfile:chr_file getattr;
dontaudit lvm_t device_t:{ fifo_file dir chr_file blk_file } getattr;
dontaudit lvm_t devpts_t:dir { getattr read };

ifdef(`gpm.te', `
dontaudit lvm_t gpmctl_t:sock_file getattr;
')
dontaudit lvm_t initctl_t:fifo_file getattr;
allow lvm_t sbin_t:dir search;
dontaudit lvm_t sbin_t:file getattr;
allow lvm_t lvm_control_t:chr_file rw_file_perms;
allow initrc_t lvm_control_t:chr_file { getattr read unlink };
allow initrc_t device_t:chr_file create;
dontaudit lvm_t var_run_t:dir getattr;

# for when /usr is not mounted
dontaudit lvm_t file_t:dir search;

allow lvm_t tmpfs_t:dir r_dir_perms;
r_dir_file(lvm_t, selinux_config_t)

# it has no reason to need this
dontaudit lvm_t proc_kcore_t:file getattr;