systemd_..._selinux(8)

💅 systemd_..._selinux(8) — the SELinux tea for systemd_coredump

okay so bestie, this is a page from the SELinux Policy systemd_coredump manual (yes the title is literally systemd_..._selinux(8), the dots are doing main character energy). Sit down, grab a strawberry drink 🍓, and let's get into it.

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✨ NAME ✨

systemd_coredump_selinux — the Security Enhanced Linux Policy for the systemd_coredump processes 🫶

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the systemd_coredump processes via flexible mandatory access control. That's the whole vibe — SELinux is the bouncer at the club and it is thorough. 💅

The systemd_coredump processes execute with the systemd_coredump_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 systemd_coredump_t

literally that's it. go look. i'll wait. ⭐

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🦋 ENTRYPOINTS 🦋

The systemd_coredump_t SELinux type can be entered via the systemd_coredump_exec_t file type.

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

/usr/lib/systemd/systemd-coredump

one singular path, and she is iconic for it. 👑

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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 systemd_coredump policy is very flexible allowing users to setup their systemd_coredump processes in as secure a method as possible.

The following process types are defined for systemd_coredump:

• systemd_coredump_t

Note: semanage permissive -a systemd_coredump_t can be used to make the process type systemd_coredump_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 ✨judges✨ you in the logs. 💀

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🎀 BOOLEANS 🎀

SELinux policy is customizable based on least access required. systemd_coredump policy is extremely flexible and has several booleans that allow you to manipulate the policy and run systemd_coredump with the tightest access possible.

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

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

three booleans, no cap. flip them responsibly bestie 🧚

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🌈 MANAGED FILES 🌈

The SELinux process type systemd_coredump_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 may", DAC said "not so fast" 😭)

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

root_t

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

look at all those paths slaying in alphabetical-ish order 💜

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🫶 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 systemd_coredump policy is very flexible allowing users to setup their systemd_coredump processes in as secure a method as possible.

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the systemd_coredump, 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 systemd_coredump_exec_t '/srv/systemd_coredump/content(/.*)?'
restorecon -R -v /srv/mysystemd_coredump_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies stay winning 🎀

The following file types are defined for systemd_coredump:

systemd_coredump_exec_t

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

systemd_coredump_tmpfs_t

• Set files with the systemd_coredump_tmpfs_t type, if you want to store systemd coredump files on a tmpfs file system.

systemd_coredump_var_lib_t

• Set files with the systemd_coredump_var_lib_t type, if you want to store the systemd coredump files under the /var/lib 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. so like chcon = a temporary tattoo, semanage fcontext = actual permanent ink. choose wisely 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.

(the GUI one is for when you're feeling clicky instead of typey, we don't judge 🦋)

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👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. a robot wrote my homework and honestly it ate. 🤖✨

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🌟 SEE ALSO 🌟

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

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and that's the whole page bestie, go forth and label things correctly 💜

sign-off: this was systemd_coredump, dated 26-10-06, from systemd_..._selinux(8) — periodt. 🌈💅