tangd_selinux(8)

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

💅 tangd_selinux — the SELinux policy page for the tangd processes

okay so this is tangd_selinux(8), the manpage for the SELinux policy that governs tangd — yes that tangd, the one that does the tang keyserver thing. we're folding the manual name in right here at the top so you're not confused: it's tangd_selinux, section 8. slay. let's get into it 💖

✨ NAME ✨

tangd_selinux — the Security Enhanced Linux Policy for the tangd processes 🫶

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the tangd processes via flexible mandatory access control. no cap, that's the whole vibe — SELinux is the bouncer and tangd's gotta show ID.

The tangd processes execute with the tangd_t SELinux type. wanna check if you've got these processes running? just run the ps command with the -Z qualifier, bestie.

For example:

ps -eZ | grep tangd_t

that's it. that's the check. ⭐

🦋 ENTRYPOINTS 🦋

The tangd_t SELinux type can be entered via the tangd_exec_t file type. that's the doorway, iykyk.

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

/usr/libexec/tangd, /usr/libexec/tangd-keygen, /usr/libexec/tangd-update

those three. those are the doors. 🚪✨

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. very main character energy of it.

You can see the context of a process using the -Z option to ps. (yes, same trick as before, it's literally the same flag, she's consistent 💅)

Policy governs the access confined processes have to files. SELinux tangd policy is very flexible allowing users to setup their tangd processes in as secure a method as possible. flexible and secure — she contains multitudes.

The following process types are defined for tangd:

  • tangd_t
Note: semanage permissive -a tangd_t can be used to make the process type tangd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like... she's not gonna stop you, but she WILL be writing it all down in her notes. 🙈

💖 BOOLEANS 💖

SELinux policy is customizable based on least access required. tangd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run tangd with the tightest access possible. it's giving "you can sit with us but only if you follow the rules."

If you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on the daemons_dontaudit_scheduling boolean. Enabled by default.

setsebool -P daemons_dontaudit_scheduling 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

two booleans, both default-on, both iconic. 🌈

🎀 PORT TYPES 🎀

SELinux defines port types to represent TCP and UDP ports. ports have types now. yes. everything has a type. this is SELinux's whole personality.

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 tangd policy is very flexible allowing users to setup their tangd processes in as secure a method as possible. (she said it again but honestly she's right.)

The following port types are defined for tangd:

  • tangd_port_t

Default Defined Ports:

          tcp 7406

tcp 7406. write it down. 🍓

🔥 MANAGED FILES 🔥

The SELinux process type tangd_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 yes but the UID check still has to say yes too — teamwork, bestie 🤝)

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

root_t

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

that's the literal root directory in there, no big deal, just / casually hanging out in the list 💀

tangd_cache_t

/var/cache/tang(/.*)?

tangd_db_t

/var/db/tang(/.*)?

ok that's the full list, nobody skipped, not even the weird ones. periodt. 💜

🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. extended attributes are the receipts, basically.

You can see the context of a file using the -Z option to ls. (third -Z of the page. she loves that flag. we love that for her.)

Policy governs the access confined processes have to these files. SELinux tangd policy is very flexible allowing users to setup their tangd processes in as secure a method as possible.

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the tangd, 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 tangd_exec_t '/srv/tangd/content(/.*)?'
restorecon -R -v /srv/mytangd_content

(yes, the two paths are different in the example, and that's exactly how it's written — i'm not gonna "fix" it, i don't make the rules, i just relay them 🫡✨)

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex my beloved.

The following file types are defined for tangd:

tangd_cache_t

  • Set files with the tangd_cache_t type, if you want to store the files under the /var/cache directory.

tangd_db_t

  • Set files with the tangd_db_t type, if you want to treat the files as tangd database content.

tangd_exec_t

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

Paths:

/usr/libexec/tangd, /usr/libexec/tangd-keygen, /usr/libexec/tangd-update

tangd_unit_file_t

  • Set files with the tangd_unit_file_t type, if you want to treat the files as tangd unit content.

Paths:

/usr/lib/systemd/system/tang.*, /usr/lib/systemd/system/tangd-keygen.*
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. so like — chcon is the temporary tattoo, semanage fcontext + restorecon is the real one. choose wisely 💅

🫶 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.

five semanage subcommands and one GUI. the semanage family is literally carrying this whole page ngl 👑

💀 AUTHOR 💀

This manual page was auto-generated using sepolicy manpage .

yep. a robot wrote it. and now i rewrote the robot's homework. we've come full circle. 🔄✨

🌟 SEE ALSO 🌟

go read those next, bestie, the lore goes deep 📚💖

and that's the whole page!! this was auto-generated for tangd, dated 26-10-06, and it's the tangd_selinux(8) you know and love. mwah. 💋✨

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