mpd_selinux(8)

📦
version 20250627+git412.dbf877ab7 · 7 versions
, in opensuse-leap 16.0

💅 mpd_selinux(8) — the mpd_selinux page, but make it make sense

okay so bestie, welcome to the manual page for mpd_selinux — that's the Security Enhanced Linux Policy situation for the mpd processes. yes, the music daemon. yes, we're doing SELinux today. slay 🎀

✨ NAME ✨

mpd_selinux — Security Enhanced Linux Policy for the mpd processes

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the mpd processes via flexible mandatory access control. that's the whole vibe: SELinux is the bouncer at the club and mpd doesn't get to just wander in wherever 💅

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

literally just vibe-checking your processes, no cap 🔥

🦋 ENTRYPOINTS 🦋

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:

/usr/bin/mpd

that's the one door in, iykyk 🚪✨

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system.

You can see the context of a process using the -Z option to ps.

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. highkey iconic behavior 🌈

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. so like, it stops blocking you but it's still gonna talk about you behind your back 😭💀

💖 BOOLEANS 💖

SELinux policy is customizable based on least access required. mpd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run mpd with the tightest access possible. tiny toggles, huge main character energy ✨

  • mpd_enable_homedirs — if you want to determine whether mpd can traverse user home directories, you must turn on this boolean. Disabled by default.
setsebool -P mpd_enable_homedirs 1
  • mpd_use_cifs — if you want to determine whether mpd can use cifs file systems, you must turn on this boolean. Disabled by default.
setsebool -P mpd_use_cifs 1
  • mpd_use_nfs — if you want to determine whether mpd can use nfs file systems, you must turn on this boolean. Disabled by default.
setsebool -P mpd_use_nfs 1
  • daemons_dontaudit_scheduling — if you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on this boolean. Enabled by default.
setsebool -P daemons_dontaudit_scheduling 1
  • fips_mode — if you want to allow all domains to execute in fips_mode, you must turn on this boolean. Enabled by default.
setsebool -P fips_mode 1
  • nis_enabled — if you want to allow system to run with NIS, you must turn on this boolean. Disabled by default.
setsebool -P nis_enabled 1
  • use_nfs_home_dirs — if you want to support NFS home directories, you must turn on this boolean. Enabled by default.
setsebool -P use_nfs_home_dirs 1
  • use_samba_home_dirs — if you want to support SAMBA home directories, you must turn on this boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1

🎀 PORT TYPES 🎀

SELinux defines port types to represent TCP and UDP ports.

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:

mpd_port_t

Default Defined Ports:

          tcp 6600

6600, the classic. we know her 🍓

🧚 MANAGED FILES 🧚

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. yes, SELinux said yes does not mean the UID said yes — two whole layers, we love boundaries 💜

cifs_t — listed with no paths attached, bestie's just a name here

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

/run/crm(/.*)?
/run/cman_.*
/run/rsctmp(/.*)?
/run/aisexec.*
/run/heartbeat(/.*)?
/run/pcsd-ruby.socket
/run/corosync-qnetd(/.*)?
/run/corosync-qdevice(/.*)?
/run/pcsd.socket
/run/corosync.pid
/run/cpglockd.pid
/run/rgmanager.pid
/run/cluster/rgmanager.sk

krb5_host_rcache_t

/var/tmp/krb5_0.rcache2
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0

mpd_data_t

/var/lib/mpd/music(/.*)?
/var/lib/mpd/playlists(/.*)?

mpd_home_t

/home/[^/]+/.mpd(/.*)?

mpd_tmp_t — no paths listed, she's on her own journey

mpd_tmpfs_t — same, no paths, still valid ✨

mpd_var_lib_t

/var/lib/mpd(/.*)?

mpd_var_run_t

/run/mpd(/.*)?

nfs_t — no paths listed here either

root_t

/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp

💀 FILE CONTEXTS 💀

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls.

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 directory you would execute the following command:

semanage fcontext -a -e /var/lib/mpd /srv/mpd
restorecon -R -v /srv/mpd

it's giving "same data, new address" 🏡✨

🫶 STANDARD FILE CONTEXT 🫶

SELinux defines the file context types for the mpd, if you wanted to store files with these types in a different paths, you need to execute the semanage command to specify alternate labeling and then use restorecon to put the labels on disk.

semanage fcontext -a -t mpd_exec_t '/srv/mpd/content(/.*)?'
restorecon -R -v /srv/mympd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 🙈

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. Paths:
/var/lib/mpd/music(/.*)?, /var/lib/mpd/playlists(/.*)?
  • 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. chcon is the temporary tattoo, semanage fcontext is the real one, periodt 💅

🔥 COMMANDS 🔥

  • semanage fcontext can also be used to manipulate default file context mappings.
  • 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.

semanage really said "I contain multitudes" 👑✨

🌈 AUTHOR 🌈

This manual page was auto-generated using sepolicy manpage .

(not me writing this by hand, the robots did it, I just added the sparkle 🧚)

⭐ SEE ALSO ⭐

selinux(8), mpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

okay that's the whole page bestie, go forth and label responsibly 🦋💖

this masterpiece was brought to you by mpd, dated 26-10-06, serving you mpd_selinux(8) realness — mwah, love u, bye 💅🎀

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