ccs_selinux(8)

💅 ccs_selinux — the SELinux glow-up for ccs processes

okay bestie, so this is the ccs_selinux(8) page — it's the SELinux policy manual for the ccs processes, and yes it's a whole vibe. Let's get into it. ✨

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🎀 NAME

ccs_selinux — Security Enhanced Linux Policy for the ccs processes

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✨ DESCRIPTION

Security-Enhanced Linux secures the ccs processes via flexible mandatory access control. That's the whole point — SELinux is out here being the bouncer for your ccs processes, no cap. 💅

The ccs processes execute with the ccs_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 ccs_t

Like, run that and see if ccs_t shows up. If it does, hey bestie, you've got ccs processes. 🫶

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🚪 ENTRYPOINTS

The ccs_t SELinux type can be entered via the ccs_exec_t file type.

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

/usr/bin/ccsd

So that's the door. That's the one file that gets you into the ccs_t domain. 👑

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👯 PROCESS TYPES

SELinux defines process types (domains) for each process running on the system. Think of a domain like the process's little outfit — it decides what it's allowed to touch. 🎀

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

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

The following process types are defined for ccs:

ccs_t

Note: semanage permissive -a ccs_t can be used to make the process type ccs_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. So like, it's not a free pass — it's just a "we're logging it instead of blocking it" era. 💀

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🔘 BOOLEANS

SELinux policy is customizable based on least access required. ccs policy is extremely flexible and has several booleans that allow you to manipulate the policy and run ccs with the tightest access possible. Least privilege is literally the main character here, periodt.

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 confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.

setsebool -P nscd_use_shm 1

Three booleans, all enabled by default. The -P makes it persistent btw — without it, your change ghosts you at reboot. 🙈

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🗂 MANAGED FILES

The SELinux process type ccs_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.

ccs_tmp_t

ccs_tmpfs_t

ccs_var_lib_t

/var/lib/cluster/((ccs)|(ccsd)).*

ccs_var_run_t

/run/cluster/((ccs)|(ccsd)).pid
/run/cluster/((ccs)|(ccsd)).sock

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

qpidd_tmpfs_t

root_t

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

unlabeled_t

Like, remember — even with all this, the process's UID still needs DAC permissions. SELinux doesn't override boring old Unix permissions, it stacks on top. 🍓

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

🌸 STANDARD FILE CONTEXT

SELinux defines the file context types for the ccs, 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 ccs_exec_t '/srv/ccs/content(/.*)?'
restorecon -R -v /srv/myccs_content

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

The following file types are defined for ccs:

• ccs_exec_t — Set files with the ccs_exec_t type, if you want to transition an executable to the ccs_t domain.
• ccs_initrc_exec_t — Set files with the ccs_initrc_exec_t type, if you want to transition an executable to the ccs_initrc_t domain.
• ccs_tmp_t — Set files with the ccs_tmp_t type, if you want to store ccs temporary files in the /tmp directories.
• ccs_tmpfs_t — Set files with the ccs_tmpfs_t type, if you want to store ccs files on a tmpfs file system.
• ccs_var_lib_t — Set files with the ccs_var_lib_t type, if you want to store the ccs files under the /var/lib directory.
• ccs_var_log_t — Set files with the ccs_var_log_t type, if you want to treat the data as ccs var log data, usually stored under the /var/log directory.
• ccs_var_run_t — Set files with the ccs_var_run_t type, if you want to store the ccs files under the /run or /var/run directory.

Paths:

/run/cluster/((ccs)|(ccsd)).pid, /run/cluster/((ccs)|(ccsd)).sock

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. 💅

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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.

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✍️ AUTHOR

This manual page was auto-generated using sepolicy manpage.

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👀 SEE ALSO

selinux(8), ccs(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 responsibly 🦋

sign-off szn: this page came from ccs and it's dated 26-10-06 — that's the source and the date, mwah 💖