Security-Enhanced Linux secures the mpd processes via flexible mandatory access control.
The mpd processes execute with the mpd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
For example:
ps -eZ | grep mpd_t
The mpd_t SELinux type can be entered via the mpd_exec_t file type.
The default entrypoint paths for the mpd_t domain are the following:
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux mpd policy is very flexible allowing users to setup their mpd processes in as secure a method as possible.
The following process types are defined for mpd:
mpd_t
Note: semanage permissive -a mpd_t can be used to make the process type mpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to determine whether mpd can traverse user home directories, you must turn on the mpd_enable_homedirs boolean. Disabled by default.
setsebool -P mpd_enable_homedirs 1
If you want to determine whether mpd can use cifs file systems, you must turn on the mpd_use_cifs boolean. Disabled by default.
setsebool -P mpd_use_cifs 1
If you want to determine whether mpd can use nfs file systems, you must turn on the mpd_use_nfs boolean. Disabled by default.
setsebool -P mpd_use_nfs 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
You can see the types associated with a port by using the following command:
semanage port -l
Policy governs the access confined processes have to these ports. SELinux mpd policy is very flexible allowing users to setup their mpd processes in as secure a method as possible.
The following port types are defined for mpd:
Default Defined Ports: tcp 6600
The SELinux process type mpd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.
anon_inodefs_t
cifs_t
cluster_conf_t
/etc/cluster(/.*)?
cluster_var_lib_t
/var/lib/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?
cluster_var_run_t
/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/corosync-qnetd(/.*)?
/var/run/corosync-qdevice(/.*)?
/var/run/corosync.pid
/var/run/cpglockd.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk
mpd_data_t
/var/lib/mpd/music(/.*)?
/var/lib/mpd/playlists(/.*)?
mpd_home_t
/home/[^/]+/.mpd(/.*)?
mpd_tmp_t
mpd_tmpfs_t
mpd_var_lib_t
/var/lib/mpd(/.*)?
mpd_var_run_t
/var/run/mpd(/.*)?
nfs_t
root_t
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux mpd policy is very flexible allowing users to setup their mpd processes in as secure a method as possible.
EQUIVALENCE DIRECTORIES
mpd policy stores data with multiple different file context types under the /var/lib/mpd directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:
semanage fcontext -a -e /var/lib/mpd /srv/mpd
restorecon -R -v /srv/mpd
STANDARD FILE CONTEXT
SELinux defines the file context types for the mpd, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t mpd_var_run_t '/srv/mympd_content(/.*)?'
restorecon -R -v /srv/mympd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for mpd:
mpd_data_t
- Set files with the mpd_data_t type, if you want to treat the files as mpd content.
mpd_etc_t
- Set files with the mpd_etc_t type, if you want to store mpd files in the /etc directories.
mpd_exec_t
- Set files with the mpd_exec_t type, if you want to transition an executable to the mpd_t domain.
mpd_home_t
- Set files with the mpd_home_t type, if you want to store mpd files in the users home directory.
mpd_initrc_exec_t
- Set files with the mpd_initrc_exec_t type, if you want to transition an executable to the mpd_initrc_t domain.
mpd_log_t
- Set files with the mpd_log_t type, if you want to treat the data as mpd log data, usually stored under the /var/log directory.
mpd_tmp_t
- Set files with the mpd_tmp_t type, if you want to store mpd temporary files in the /tmp directories.
mpd_tmpfs_t
- Set files with the mpd_tmpfs_t type, if you want to store mpd files on a tmpfs file system.
mpd_user_data_t
- Set files with the mpd_user_data_t type, if you want to treat the files as mpd user content.
mpd_var_lib_t
- Set files with the mpd_var_lib_t type, if you want to store the mpd files under the /var/lib directory.
mpd_var_run_t
- Set files with the mpd_var_run_t type, if you want to store the mpd files under the /run or /var/run directory.
Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
semanage permissive can also be used to manipulate whether or not a process type is permissive.
semanage module can also be used to enable/disable/install/remove policy modules.
semanage port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.