fail2ban_selinux(8)

💅 fail2ban_selinux 💅

okay so bestie, this is the manual page for the SELinux policy that keeps your fail2ban processes in check — it's called fail2ban_selinux, and honestly? it's giving security guard energy for your fail2ban setup. let's get into it 🫶

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✨ NAME ✨

fail2ban_selinux — Security Enhanced Linux Policy for the fail2ban processes

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the fail2ban processes via flexible mandatory access control. no cap, it's literally locking things down so your fail2ban can do its thing safely.

The fail2ban processes execute with the fail2ban_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 fail2ban_t

see? easy peasy. go check your vibes ✨

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🦋 ENTRYPOINTS 🦋

The fail2ban_t SELinux type can be entered via the fail2ban_exec_t file type.

The default entrypoint paths for the fail2ban_t domain are the following:

/usr/bin/fail2ban, /usr/bin/fail2ban-server

those are the doors into the domain, basically. main character entries only 💅

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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 fail2ban policy is very flexible allowing users to setup their fail2ban processes in as secure a method as possible. periodt.

The following process types are defined for fail2ban:

fail2ban_t, fail2ban_client_t

Note: semanage permissive -a fail2ban_t can be used to make the process type fail2ban_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it's chill but it's still watching you 👀

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🎀 BOOLEANS 🎀

SELinux policy is customizable based on least access required. fail2ban policy is extremely flexible and has several booleans that allow you to manipulate the policy and run fail2ban 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 little switches, three little vibes. flip responsibly 🔥

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🍓 MANAGED FILES 🍓

The SELinux process type fail2ban_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. (iykyk)

• 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

• fail2ban_tmp_t
• fail2ban_var_run_t

/run/fail2ban(/.*)?

• 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

like, that's a lot of file types but bestie, it's all listed. nothing skipped 💖

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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 fail2ban policy is very flexible allowing users to setup their fail2ban processes in as secure a method as possible.

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the fail2ban, 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 fail2ban_exec_t '/srv/fail2ban/content(/.*)?'
restorecon -R -v /srv/myfail2ban_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. sneaky but iconic 💅

The following file types are defined for fail2ban:

• fail2ban_client_exec_t — Set files with the fail2ban_client_exec_t type, if you want to transition an executable to the fail2ban_client_t domain.
• fail2ban_exec_t — Set files with the fail2ban_exec_t type, if you want to transition an executable to the fail2ban_t domain.

Paths:

/usr/bin/fail2ban, /usr/bin/fail2ban-server

• fail2ban_initrc_exec_t — Set files with the fail2ban_initrc_exec_t type, if you want to transition an executable to the fail2ban_initrc_t domain.
• fail2ban_log_t — Set files with the fail2ban_log_t type, if you want to treat the data as fail2ban log data, usually stored under the /var/log directory.
• fail2ban_tmp_t — Set files with the fail2ban_tmp_t type, if you want to store fail2ban temporary files in the /tmp directories.
• fail2ban_var_lib_t — Set files with the fail2ban_var_lib_t type, if you want to store the fail2ban files under the /var/lib directory.
• fail2ban_var_run_t — Set files with the fail2ban_var_run_t type, if you want to store the fail2ban 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. temporary vs permanent, bestie — know the difference 😭

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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. for the visual learners out there 🎨

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👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. (so you know it's legit fr fr)

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🌟 SEE ALSO 🌟

selinux(8), fail2ban(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8), fail2ban_client_selinux(8), fail2ban_client_selinux(8)

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okay that's the whole page bestie, you ate that 🫶💖✨

sign-off: this beauty comes from the fail2ban package, version 26-10-06, dated 26-10-06 (yes, same day energy 💀). hope this helped, mwah! 💅🎀