fenced_selinux(8)

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

🌸 NAME 🌸

bestie, welcome to fenced_selinux(8) — the Security Enhanced Linux Policy for the fenced processes. This is your little group-chat cheat sheet for all the SELinux fenced lore, and it's giving mandatory access control with main character energy 💅.

✨ DESCRIPTION ✨

Security-Enhanced Linux secures the fenced processes via flexible mandatory access control — no cap, that's the whole vibe.

The fenced processes execute with the fenced_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 fenced_t

🦋 ENTRYPOINTS 🦋

The fenced_t SELinux type can be entered via the fenced_exec_t file type.

The default entrypoint paths for the fenced_t domain are literally these:

/usr/bin/fenced
/usr/bin/fence_node
/usr/bin/fence_tool
/usr/bin/fence_virtd
/usr/bin/fence_sanlockd
/usr/share/cluster/fence_scsi_check
/usr/share/cluster/fence_mpath_check
/usr/share/cluster/fence_scsi_check.pl
/usr/lib/systemd/systemd-fence_sanlockd
/usr/share/cluster/fence_scsi_check_hardreboot
/usr/share/cluster/fence_mpath_check_hardreboot

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system, periodt.

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

Policy governs the access confined processes have to files. SELinux fenced policy is very flexible, allowing users to setup their fenced processes in as secure a method as possible — iconic behavior, honestly.

The following process types are defined for fenced:

  • fenced_t — the one and only process type on this list, slay.
Note: semanage permissive -a fenced_t can be used to make the process type fenced_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. fenced policy is extremely flexible and has several booleans that allow you to manipulate the policy and run fenced with the tightest access possible.

If you want to determine whether fenced can connect to the TCP network, you must turn on the fenced_can_network_connect boolean. Disabled by default.

setsebool -P fenced_can_network_connect 1

If you want to determine whether fenced can use ssh, you must turn on the fenced_can_ssh boolean. Disabled by default.

setsebool -P fenced_can_ssh 1

If you want to allow cluster administrative cluster domains memcheck-amd64- to use executable memory, you must turn on the cluster_use_execmem boolean. Disabled by default.

setsebool -P cluster_use_execmem 1

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

🎀 MANAGED FILES 🎀

The SELinux process type fenced_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 — default path time:
/etc/cluster(/.*)?
  • cluster_log — it's listed as a managed file type, but this page doesn't spell out default paths for it.
  • cluster_tmpfs_t — same situation, bestie: listed as a managed file type with no default path list here.
  • cluster_var_lib_t — default paths:
/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 — default paths:
/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
  • fenced_lock_t — default path:
/run/lock/fence_manual.lock
  • fenced_tmp_t — listed as a managed file type, with no default path list shown here.
  • fenced_tmpfs_t — listed as a managed file type too, and again no default paths in this page.
  • fenced_var_run_t — default paths:
/run/fence.*
/run/cluster/fence_scsi.*
/run/cluster/mpath.devices
/run/cluster/fenced_override
  • krb5_host_rcache_t — default paths:
/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 — default paths:
/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp
  • snmpd_var_lib_t — default paths:
/var/agentx(/.*)?
/var/net-snmp(/.*)
/var/lib/snmp(/.*)?
/var/net-snmp(/.*)?
/var/lib/net-snmp(/.*)?
/var/spool/snmptt(/.*)?
/usr/share/snmp/mibs/.index

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the fenced, and 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 fenced_exec_t '/srv/fenced/content(/.*)?'
restorecon -R -v /srv/myfenced_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.

The following file types are defined for fenced:

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

Paths:

/usr/bin/fenced
/usr/bin/fence_node
/usr/bin/fence_tool
/usr/bin/fence_virtd
/usr/bin/fence_sanlockd
/usr/share/cluster/fence_scsi_check
/usr/share/cluster/fence_mpath_check
/usr/share/cluster/fence_scsi_check.pl
/usr/lib/systemd/systemd-fence_sanlockd
/usr/share/cluster/fence_scsi_check_hardreboot
/usr/share/cluster/fence_mpath_check_hardreboot
  • fenced_lock_t — set files with the fenced_lock_t type if you want to treat the files as fenced lock data, stored under the /var/lock directory.
  • fenced_tmp_t — set files with the fenced_tmp_t type if you want to store fenced temporary files in the /tmp directories.
  • fenced_tmpfs_t — set files with the fenced_tmpfs_t type if you want to store fenced files on a tmpfs file system.
  • fenced_var_log_t — set files with the fenced_var_log_t type if you want to treat the data as fenced var log data, usually stored under the /var/log directory.
  • fenced_var_run_t — set files with the fenced_var_run_t type if you want to store the fenced files under the /run or /var/run directory.

Paths:

/run/fence.*
/run/cluster/fence_scsi.*
/run/cluster/mpath.devices
/run/cluster/fenced_override
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), fenced(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

okay that's the whole page 🫶 — source/version fenced, date 26-10-06, and it's still the fenced_selinux(8) manual, periodt ✨

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