mplayer_selinux(8)

💅 mplayer_selinux(8) — the mplayer_selinux glow-up 🎀

okay bestie, welcome to the mplayer_selinux(8) page, aka the manual for Security Enhanced Linux Policy for the mplayer processes ✨ (yes, that's the NAME section, we're being official for like two seconds).

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the mplayer processes via flexible mandatory access control. no cap, that's the whole vibe — SELinux is the bouncer at the club and mplayer has a wristband 🫶

The mplayer processes execute with the mplayer_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 mplayer_t

literally that's it. run it, see the vibes, slay 💜

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🚪 ENTRYPOINTS 🚪

The mplayer_t SELinux type can be entered via the mplayer_exec_t file type.

The default entrypoint paths for the mplayer_t domain are the following:

/usr/bin/vlc, /usr/bin/xine, /usr/bin/mplayer

three doors into the same party, iconic behavior honestly 💅

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👑 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 mplayer policy is very flexible allowing users to setup their mplayer processes in as secure a method as possible. highkey the whole point 🧚

The following process types are defined for mplayer:

• mplayer_t

Note: semanage permissive -a mplayer_t can be used to make the process type mplayer_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 still side-eyes you and writes it down 📝

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🎀 BOOLEANS 🎀

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

If you want to determine whether mplayer can make its stack executable, you must turn on the mplayer_execstack boolean. Disabled by default.

setsebool -P mplayer_execstack 1

If you want to deny user domains applications to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla, you must turn on the deny_execmem boolean. Disabled by default.

⚠️ bestie this one is literally flagged as dangerous in the docs — the executable should be reported in bugzilla. not me warning you twice 😭

setsebool -P deny_execmem 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 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 regular users direct dri device access, you must turn on the selinuxuser_direct_dri_enabled boolean. Disabled by default.

setsebool -P selinuxuser_direct_dri_enabled 1

If you want to allow all unconfined executables to use libraries requiring text relocation that are not labeled textrel_shlib_t, you must turn on the selinuxuser_execmod boolean. Disabled by default.

setsebool -P selinuxuser_execmod 1

If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean. Enabled by default.

setsebool -P use_nfs_home_dirs 1

If you want to support SAMBA home directories, you must turn on the use_samba_home_dirs boolean. Disabled by default.

setsebool -P use_samba_home_dirs 1

If you want to allows clients to write to the X server shared memory segments, you must turn on the xserver_clients_write_xshm boolean. Disabled by default.

setsebool -P xserver_clients_write_xshm 1

(yes, that grammar is exactly how the original says it — we do not gatekeep the source material 💖)

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🗂️ MANAGED FILES 🗂️

The SELinux process type mplayer_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. SELinux said "you still need perms babes, I'm not doing everything for you" 🙈

cifs_t

that's it. no paths listed. she's mysterious 🦋

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

nfs_t

also no paths. elusive icon 💅

pulseaudio_home_t

/root/.pulse(/.*)?
/root/.config/pulse(/.*)?
/root/.esd_auth
/root/.pulse-cookie
/home/[^/]+/.pulse(/.*)?
/home/[^/]+/.config/pulse(/.*)?
/home/[^/]+/.esd_auth
/home/[^/]+/.pulse-cookie

audio girlies stay winning 🎧

user_home_t

/home/[^/]+/.+

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📁 FILE CONTEXTS 📁

SELinux requires files to have an extended attribute to define the file type. it's giving "files need a little name tag" 🏷️

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 mplayer policy is very flexible allowing users to setup their mplayer processes in as secure a method as possible. (yes, we said that twice, it's important ✨)

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the mplayer, 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 mplayer_exec_t '/srv/mplayer/content(/.*)?'
restorecon -R -v /srv/mymplayer_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 🙌

The following file types are defined for mplayer:

mplayer_etc_t

• Set files with the mplayer_etc_t type, if you want to store mplayer files in the /etc directories.

mplayer_exec_t

• Set files with the mplayer_exec_t type, if you want to transition an executable to the mplayer_t domain.

Paths:

/usr/bin/vlc, /usr/bin/xine, /usr/bin/mplayer

mplayer_home_t

• Set files with the mplayer_home_t type, if you want to store mplayer files in the users home directory.

mplayer_tmpfs_t

• Set files with the mplayer_tmpfs_t type, if you want to store mplayer files on a tmpfs file system.

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. tl;dr: chcon = a temporary tattoo, semanage fcontext + restorecon = actual permanent ink 🔥 don't mix them up bestie.

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🛠️ 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 boolean can also be used to manipulate the booleans

system-config-selinux is a GUI tool available to customize SELinux policy settings. for the visual learners 🖥️✨

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✍️ AUTHOR ✍️

This manual page was auto-generated using sepolicy manpage. a bot wrote it and honestly? it ate 🤖💅

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👀 SEE ALSO 👀

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

go read those next, iykyk 📚🦋

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and that's the whole page bestie!! mwah 💖

sign-off time: this lil masterpiece is mplayer, dated 26-10-06, and it lives at mplayer_selinux(8). periodt. 🎀✨