irc_selinux(8)

💅 irc_selinux(8) — the SELinux tea for your irc era

okay bestie, welcome to irc_selinux(8), from the SELinux Policy irc collection ✨ this is the whole glow-up guide for how SELinux handles your irc processes, and honestly it ate.

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🎀 NAME

irc_selinux — the Security Enhanced Linux Policy for the irc processes, no cap 💖

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🦋 DESCRIPTION

Security-Enhanced Linux secures the irc processes via flexible mandatory access control. like, it's literally the bodyguard of your IRC setup 🫶

The irc processes execute with the irc_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier. it's giving "vibe check your processes" 😌

For example:

ps -eZ | grep irc_t

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🌸 ENTRYPOINTS

The irc_t SELinux type can be entered via the irc_exec_t file type. that's the doorway, the main character entrance 🔥

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

/usr/bin/[st]irc, /usr/bin/ircII, /usr/bin/irssi, /usr/bin/tinyirc

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👑 PROCESS TYPES

SELinux defines process types (domains) for each process running on the system. yes, every process gets its own little personality 💅

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

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

The following process types are defined for irc:

• irc_t

Note: semanage permissive -a irc_t can be used to make the process type irc_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so it stops blocking but it still talks about it — the group chat stays active 😭

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✨ BOOLEANS

SELinux policy is customizable based on least access required. irc policy is extremely flexible and has several booleans that allow you to manipulate the policy and run irc with the tightest access possible. tightest access = the most locked-down slay 🔐

If you want to determine whether irc clients can listen on and connect to any unreserved TCP ports, you must turn on the irc_use_any_tcp_ports boolean. Disabled by default.

setsebool -P irc_use_any_tcp_ports 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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🌈 PORT TYPES

SELinux defines port types to represent TCP and UDP ports. ports have types too, everyone's somebody 💜

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

The following port types are defined for irc:

• ircd_port_t

Default Defined Ports:

tcp 6667,6697

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🧚 MANAGED FILES

The SELinux process type irc_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. like SELinux said yes but DAC might still say no, it's a two-key system 🙈

• cifs_t
• ecryptfs_t

/home/[^/]+/.Private(/.*)?
/home/[^/]+/.ecryptfs(/.*)?

• fusefs_t

/run/user/[0-9]+/gvfs

• irc_home_t

/home/[^/]+/.irssi(/.*)?
/home/[^/]+/irclog(/.*)?
/home/[^/]+/.ircmotd

• irc_tmp_t
• 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

• nfs_t
• user_home_t

/home/[^/]+/.+

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💖 FILE CONTEXTS

SELinux requires files to have an extended attribute to define the file type. every file's got lore ✨

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

⭐ STANDARD FILE CONTEXT

SELinux defines the file context types for the irc, 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. move it, relabel it, slay it 💅

semanage fcontext -a -t irc_exec_t '/srv/irc/content(/.*)?'
restorecon -R -v /srv/myirc_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 😌

The following file types are defined for irc:

irc_conf_t

• Set files with the irc_conf_t type, if you want to treat the files as irc configuration data, usually stored under the /etc directory. config files said "i live in /etc" and honestly iconic.

irc_exec_t

• Set files with the irc_exec_t type, if you want to transition an executable to the irc_t domain. this is the glow-up pipeline 🔥

Paths:

/usr/bin/[st]irc, /usr/bin/ircII, /usr/bin/irssi, /usr/bin/tinyirc

irc_home_t

• Set files with the irc_home_t type, if you want to store irc files in the users home directory. home sweet home directory 🎀

Paths:

/home/[^/]+/.irssi(/.*)?, /home/[^/]+/irclog(/.*)?,
/home/[^/]+/.ircmotd

irc_tmp_t

• Set files with the irc_tmp_t type, if you want to store irc temporary files in the /tmp directories. temporary but make it cute 🍓

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 quick temporary fix and semanage fcontext + restorecon is the forever commitment, iykyk 💀

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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 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. a whole GUI, for the visual learners 👑

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🎤 AUTHOR

This manual page was auto-generated using sepolicy manpage . — yes the machine wrote it, but we gave it the makeover 💖

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🔗 SEE ALSO

selinux(8), irc(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 be secure 🦋

🌸 sign-off tea: this one's irc, dated 26-10-06, and it lives at irc_selinux(8) — the version/date line at the bottom, but make it cute. periodt. 💜