smsd_selinux(8)

📦 version 38.1.87, in centos-stream 9

💖 smsd_selinux — the SELinux policy page for smsd, but make it make sense 🎀

okay so bestie, this is the smsd_selinux manual page (that's the smsd_selinux(8) situation) — it's the Security Enhanced Linux policy page for the smsd processes. yes it's a mouthful. no we're not skipping anything. let's go ✨

🌸 NAME 🌸

smsd_selinux — Security Enhanced Linux Policy for the smsd processes, periodt.

🦋 SYNOPSIS 🦋

this is one of those pages where the synopsis is basically "read the description, bestie" — so scroll down, it's all there 💅

💜 DESCRIPTION 💜

Security-Enhanced Linux secures the smsd processes via flexible mandatory access control. iconic behaviour tbh.

the smsd processes execute with the smsd_t SELinux type. you can check if you have these processes running by executing the ps command with the -Z qualifier.

for example (copy it exactly, no cap):

ps -eZ | grep smsd_t

🧚 ENTRYPOINTS 🧚

the smsd_t SELinux type can be entered via the smsd_exec_t file type.

the default entrypoint paths for the smsd_t domain are literally these:

/usr/sbin/smsd

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. main character energy for every single process, honestly.

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

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

the following process types are defined for smsd:

  • smsd_t
Note: semanage permissive -a smsd_t can be used to make the process type smsd_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 about it but it's still taking notes 📝

🔥 BOOLEANS 🔥

SELinux policy is customizable based on least access required. smsd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run smsd with the tightest access possible. tightest access = bestie-approved 🔐

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 smsd_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 — SELinux can't fix that for you, sorry 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

/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/pcsd-ruby.socket
/var/run/corosync-qnetd(/.*)?
/var/run/corosync-qdevice(/.*)?
/var/run/pcsd.socket
/var/run/corosync.pid
/var/run/cpglockd.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk

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/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd

smsd_log_t

/var/log/smsd(/.*)?

smsd_spool_t

/var/spool/sms(/.*)?

smsd_tmp_t

(no default paths listed for this one — it's just vibes ✨)

smsd_var_lib_t

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

smsd_var_run_t

/var/run/smsd(/.*)?

🎀 FILE CONTEXTS 🎀

SELinux requires files to have an extended attribute to define the file type. yes, every file needs its little label. it's giving name-tag energy 🏷️

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the smsd, 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. like this:

semanage fcontext -a -t smsd_tmp_t '/srv/mysmsd_content(/.*)?'
restorecon -R -v /srv/mysmsd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies stay winning 🫶

the following file types are defined for smsd:

smsd_exec_t

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

smsd_initrc_exec_t

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

smsd_log_t

  • Set files with the smsd_log_t type, if you want to treat the data as smsd log data, usually stored under the /var/log directory.

smsd_spool_t

  • Set files with the smsd_spool_t type, if you want to store the smsd files under the /var/spool directory.

smsd_tmp_t

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

smsd_var_lib_t

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

smsd_var_run_t

  • Set files with the smsd_var_run_t type, if you want to store the smsd 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 boolean can also be used to manipulate the booleans. (no -P erasure here, it's just how it is 😌)

system-config-selinux is a GUI tool available to customize SELinux policy settings — for when you want buttons instead of typing 🖱️✨

🦋 AUTHOR 🦋

This manual page was auto-generated using sepolicy manpage. the robots did it, not me 🙈

🌟 SEE ALSO 🌟

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

and that's the whole thing, bestie! this page dropped as smsd on 26-10-23 and it's the smsd_selinux(8) glow-up edition — go forth and label responsibly 💜🎀🦋

📦 where this page comes from