telnetd_selinux(8)

📦
version 20250627+git412.dbf877ab7 · 7 versions
, in opensuse-leap 16.0

✨ telnetd_selinux(8) — the glow-up edition ✨

okay so bestie, this is the manual for telnetd_selinux — aka the Security Enhanced Linux Policy for the telnetd processes 💅. it's giving "SELinux but make it make sense" and i'm here for it. let's get into it fr fr 🫶

🌸 NAME 🌸

telnetd_selinux — Security Enhanced Linux Policy for the telnetd processes, no cap ✨

🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the telnetd processes via flexible mandatory access control. yes bestie, it's literally that girl when it comes to keeping things locked down 🔥

The telnetd processes execute with the telnetd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier. it's super easy, lowkey:

ps -eZ | grep telnetd_t

🎀 ENTRYPOINTS 🎀

The telnetd_t SELinux type can be entered via the telnetd_exec_t file type. periodt.

The default entrypoint paths for the telnetd_t domain are the following, bestie:

/usr/bin/in.telnetd, /usr/kerberos/sbin/telnetd

💖 PROCESS TYPES 💖

SELinux defines process types (domains) for each process running on the system. iconic behavior honestly.

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

Policy governs the access confined processes have to files. SELinux telnetd policy is very flexible, allowing users to setup their telnetd processes in as secure a method as possible. it's giving "customizable queen" 💅

The following process types are defined for telnetd:

  • telnetd_t
Note: semanage permissive -a telnetd_t can be used to make the process type telnetd_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, just a "we see you but we're not gonna stop you" vibe 💀

🌈 BOOLEANS 🌈

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

Here are all the booleans bestie, with their exact commands:

  • 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 run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 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
  • If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean. Enabled by default.
setsebool -P use_nfs_home_dirs 1
  • If you want to support SAMBA home directories, you must turn on the use_samba_home_dirs boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1

🧚 PORT TYPES 🧚

SELinux defines port types to represent TCP and UDP ports. fancy ✨

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 telnetd policy is very flexible allowing users to setup their telnetd processes in as secure a method as possible. we love a flexible icon 💅

The following port types are defined for telnetd:

  • telnetd_port_t

Default Defined Ports:

tcp 23

🍓 MANAGED FILES 🍓

The SELinux process type telnetd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note: the process's UID still needs to have DAC permissions. don't forget that part bestie 🙈

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

initrc_var_run_t

/run/sysconfig(/.*)?
/run/utmp
/run/keymap
/run/numlock-on
/run/setleds-on
/run/runlevel.dir
/run/setmixer_flag
/run/bootsplashctl

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

security_t

/selinux

telnetd_tmp_t

(no default paths listed, bestie 🫶)

telnetd_var_run_t

(no default paths listed, bestie 🫶)

user_tmp_t

/run/tlog(/.*)?
/run/user/[^/]+
/dev/shm/mono.*
/tmp/.ICE-unix(/.*)?
/tmp/.X11-unix(/.*)?
/dev/shm/pulse-shm.*
/run/user
/tmp/.X0-lock
/tmp/hsperfdata_root
/var/tmp/hsperfdata_root
/home/[^/]+/tmp
/home/[^/]+/.tmp
/run/user/[0-9]+
/tmp/gconfd-[^/]+

wtmp_t

/var/log/wtmp.*

wtmpdb_journal_t

/var/lib/wtmpdb/wtmp.db-journal

wtmpdb_t

/var/lib/wtmpdb(/.*)?

👑 FILE CONTEXTS 👑

SELinux requires files to have an extended attribute to define the file type. yes, it's extra, but that's the vibe.

You can see the context of a file using the -Z option to ls. iconic little flag 💅

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

STANDARD FILE CONTEXT

SELinux defines the file context types for telnetd. 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. it's a whole process but we love a labeling moment ✨

semanage fcontext -a -t telnetd_exec_t '/srv/telnetd/content(/.*)?'
restorecon -R -v /srv/mytelnetd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex queen 🧚

The following file types are defined for telnetd:

  • telnetd_exec_t — Set files with the telnetd_exec_t type, if you want to transition an executable to the telnetd_t domain.

Paths:

/usr/bin/in.telnetd, /usr/kerberos/sbin/telnetd
  • telnetd_keytab_t — Set files with the telnetd_keytab_t type, if you want to treat the files as kerberos keytab files. 🔑
  • telnetd_tmp_t — Set files with the telnetd_tmp_t type, if you want to store telnetd temporary files in the /tmp directories. 🗂️
  • telnetd_var_run_t — Set files with the telnetd_var_run_t type, if you want to store the telnetd 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. don't skip that last step bestie, i'm serious 😭

💜 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. yes, a GUI, for when you're feeling fancy 💅✨

🦋 AUTHOR 🦋

This manual page was auto-generated using sepolicy manpage. so you know it's built different fr fr 🤖✨

🌟 SEE ALSO 🌟

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

go read these next bestie, they're all part of the same vibe 🌈👑

this page was brought to you by the telnetd manual, dated 26-10-06, version telnetd_selinux(8). stay secure, stay slay 💖✨🫶

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