cyrus_selinux(8)

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

💅 cyrus_selinux — the manual page, but make it make sense

okay bestie, this is cyrus_selinux(8) — the SELinux policy page for the cyrus processes. yes it's a whole manpage, yes it's giving security-vibes, and yes we're gonna get through it together. 🫶

✨ NAME ✨

cyrus_selinux — Security Enhanced Linux Policy for the cyrus processes. literally that's the whole name section, short and iconic. 🎀

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the cyrus processes via flexible mandatory access control. no cap, that's the flex.

The cyrus processes execute with the cyrus_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier — it's giving "who dis" but for process contexts. 👑

For example:

ps -eZ | grep cyrus_t

🦋 ENTRYPOINTS 🦋

The cyrus_t SELinux type can be entered via the cyrus_exec_t file type. that's the doorway, bestie.

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

/usr/lib/cyrus/master, /usr/libexec/cyrus-imapd/master, /usr/lib/cyrus-
imapd/cyrus-master, /usr/libexec/cyrus-imapd/cyrus-master

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. yes, every process gets its own little domain, main character energy fr fr.

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

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

The following process types are defined for cyrus:

cyrus_t

Note: semanage permissive -a cyrus_t can be used to make the process type cyrus_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so it's not a free pass, it's just a "we're still watching you" pass. 😭

🔥 BOOLEANS 🔥

SELinux policy is customizable based on least access required. cyrus policy is extremely flexible and has several booleans that allow you to manipulate the policy and run cyrus with the tightest access possible. we love a customizable queen. ✨

  • 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

🌈 PORT TYPES 🌈

SELinux defines port types to represent TCP and UDP ports.

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

The following port types are defined for cyrus:

cyrus_imapd_port_t

Default Defined Ports:

          tcp 2005

🎀 MANAGED FILES 🎀

The SELinux process type cyrus_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. yes, SELinux is not out here overriding DAC, that's not the vibe.

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

cyrus_tmp_t

(no default paths listed, she's just here for the vibe 🫶)

cyrus_var_lib_t

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

cyrus_var_run_t

/run/cyrus.*

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

mail_spool_t

/var/mail(/.*)?
/var/spool/imap(/.*)?
/var/spool/mail(/.*)?
/var/spool/smtpd(/.*)?

root_t

/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp

snmpd_var_lib_t

/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. it's the file's little name tag at the party. 🏷️

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

STANDARD FILE CONTEXT

SELinux defines the file context types for the cyrus, 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. slay, relabeling era. 💅

semanage fcontext -a -t cyrus_exec_t '/srv/cyrus/content(/.*)?'
restorecon -R -v /srv/mycyrus_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex my beloved. 😌

The following file types are defined for cyrus:

cyrus_exec_t

  • Set files with the cyrus_exec_t type, if you want to transition an executable to the cyrus_t domain.

Paths:

/usr/lib/cyrus/master, /usr/libexec/cyrus-imapd/master,
/usr/lib/cyrus-imapd/cyrus-master, /usr/libexec/cyrus-imapd/cyrus-
master

cyrus_initrc_exec_t

  • Set files with the cyrus_initrc_exec_t type, if you want to transition an executable to the cyrus_initrc_t domain.

cyrus_keytab_t

  • Set files with the cyrus_keytab_t type, if you want to treat the files as kerberos keytab files.

cyrus_tmp_t

  • Set files with the cyrus_tmp_t type, if you want to store cyrus temporary files in the /tmp directories.

cyrus_var_lib_t

  • Set files with the cyrus_var_lib_t type, if you want to store the cyrus files under the /var/lib directory.

Paths:

/var/imap(/.*)?, /var/lib/imap(/.*)?

cyrus_var_run_t

  • Set files with the cyrus_var_run_t type, if you want to store the cyrus 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, know the difference bestie 💀

⭐ 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 the visual learners. 🖥️✨

💜 AUTHOR 💜

This manual page was auto-generated using sepolicy manpage. the robots wrote this one, we're just vibing with it. 🤖

🌟 SEE ALSO 🌟

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

okay that's the whole page bestie, go forth and label responsibly 💖✨

sign-off szn: this page is cyrus, dated 26-10-06, and it's the cyrus_selinux(8) manual — auto-generated, iconic, periodt. 🎀🦋

📦 where this page comes from