courier_tcpd_selinux(8)

💅 courier_tcpd_selinux(8) — SELinux Policy courier_tcpd ✨

okay bestie, this is the whole vibe for the SELinux Policy courier_tcpd manual page — aka courier_tcpd_selinux(8) — and we’re gonna make SELinux feel less like a mystery and more like a group chat you actually understand. no cap. 🦋

🌸 NAME 🌸

courier_tcpd_selinux — Security Enhanced Linux Policy for the courier_tcpd processes 💖

✨ DESCRIPTION ✨

Security-Enhanced Linux secures the courier_tcpd processes via flexible mandatory access control. it’s giving locked-down-but-flexible, periodt. 🔥

The courier_tcpd processes execute with the courier_tcpd_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 courier_tcpd_t

🚪 ENTRYPOINTS 🚪

The courier_tcpd_t SELinux type can be entered via the courier_tcpd_exec_t file type.

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

• /usr/bin/couriertcpd

👑 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 courier_tcpd policy is very flexible, allowing users to set up their courier_tcpd processes in as secure a method as possible. 💅

The following process types are defined for courier_tcpd:

• courier_tcpd_t

Note: semanage permissive -a courier_tcpd_t can be used to make the process type courier_tcpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

🎀 BOOLEANS 🎀

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

• daemons_dontaudit_scheduling — 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

• fips_mode — 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

📂 MANAGED FILES 📂

The SELinux process type courier_tcpd_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. 🔑

• 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
• courier_var_lib_t
  • /var/lib/courier(/.*)?
  • /var/lib/courier-imap(/.*)?
• courier_var_run_t
  • /run/courier(/.*)?
• root_t
  • /sysroot/.aleph-version.json
  • /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
  • /
  • /initrd
  • /var/lib/ntp

🗂️ 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 courier_tcpd policy is very flexible, allowing users to set up their courier_tcpd processes in as secure a method as possible. 🌈

🌟 STANDARD FILE CONTEXT 🌟

SELinux defines the file context types for the courier_tcpd. If you wanted to store files with these types in 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 courier_tcpd_exec_t '/srv/courier_tcpd/content(/.*)?'
restorecon -R -v /srv/mycourier_tcpd_content

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

The following file types are defined for courier_tcpd:

• courier_tcpd_exec_t — set files with the courier_tcpd_exec_t type if you want to transition an executable to the courier_tcpd_t domain.

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.

🛠️ 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.

👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage.

🔗 SEE ALSO 🔗

• selinux(8)
• courier_tcpd(8)
• semanage(8)
• restorecon(8)
• chcon(1)
• sepolicy(8)
• setsebool(8)

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that’s the whole page, bestie 🫶💖 it comes from source/version courier_tcpd, dated 26-10-06, and it lives at manual courier_tcpd_selinux(8). slay. 💅✨