rngd_selinux(8)

💜 rngd_selinux — the SELinux glow-up for rngd

okay so bestie, this is the rngd_selinux(8) page from the SELinux Policy rngd manual set, and it's literally all about how SELinux keeps the rngd processes on a leash 💅 no cap, every single detail is here, so let's go ✨

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🌸 NAME 🌸

rngd_selinux — Security Enhanced Linux Policy for the rngd processes 🎀

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🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the rngd processes via flexible mandatory access control. it's giving very "I'm watching you, but lovingly" energy fr fr.

The rngd processes execute with the rngd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier — that's the one that shows you the security context, iykyk 👑

For example:

ps -eZ | grep rngd_t

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✨ ENTRYPOINTS ✨

The rngd_t SELinux type can be entered via the rngd_exec_t file type. that's the door, bestie 🚪

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

/usr/bin/rngd

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💖 PROCESS TYPES 💖

SELinux defines process types (domains) for each process running on the system — yeah, every process gets its own little kingdom 👑

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

Policy governs the access confined processes have to files. SELinux rngd policy is very flexible, allowing users to setup their rngd processes in as secure a method as possible. very demure, very mindful 🌸

The following process types are defined for rngd:

rngd_t

Note: semanage permissive -a rngd_t can be used to make the process type rngd_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 stuff, but it's still gonna gossip about you in the logs 😭

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🎀 BOOLEANS 🎀

SELinux policy is customizable based on least access required. rngd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run rngd with the tightest access possible. tightest access = the it-girl of security settings 💅

If you want to allow rngd_t domain to use executable memory, you must turn on the rngd_execmem boolean. Disabled by default.

setsebool -P rngd_execmem 1

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

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🌈 MANAGED FILES 🌈

The SELinux process type rngd_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 isn't gonna override your regular permissions, bestie, they're a team 🤝

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

rngd_var_run_t

/run/rngd.pid

root_t

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

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🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. yes, files have vibes too, and SELinux is the vibe checker ⭐

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

STANDARD FILE CONTEXT

SELinux defines the file context types for the rngd. 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. moving day for your labels, slay 🚚✨

semanage fcontext -a -t rngd_exec_t '/srv/rngd/content(/.*)?'
restorecon -R -v /srv/myrngd_content

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

The following file types are defined for rngd:

• rngd_exec_t — Set files with the rngd_exec_t type, if you want to transition an executable to the rngd_t domain.
• rngd_initrc_exec_t — Set files with the rngd_initrc_exec_t type, if you want to transition an executable to the rngd_initrc_t domain.
• rngd_unit_file_t — Set files with the rngd_unit_file_t type, if you want to treat the files as rngd unit content.
• rngd_var_run_t — Set files with the rngd_var_run_t type, if you want to store the rngd 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. so chcon is the "just for tonight" of labels, and semanage fcontext + restorecon is the committed relationship 💀

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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. clicky clicky icon 🖱️✨

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👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage . yes, a robot wrote this. respect the robot 🫡

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🌟 SEE ALSO 🌟

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

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and that's the whole page bestie, no skips, no cuts 🎀 this beauty ships with the rngd manual, dated 26-10-06, and it's filed under rngd_selinux(8). go forth and label responsibly 💖✨