certmaster_selinux(8)

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

💅 certmaster_selinux(8) — the SELinux policy page for certmaster, but make it make sense

okay bestie, so this is from the certmaster_selinux manual — it's the SELinux policy page for the certmaster processes. grab a strawberry drink 🍓 and let's get into it.

✨ NAME ✨

certmaster_selinux — Security Enhanced Linux Policy for the certmaster processes. that's it, that's the whole name. iconic.

🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the certmaster processes via flexible mandatory access control. yes, mandatory. not like, optional. SELinux said what it said. 💅

The certmaster processes execute with the certmaster_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

for example, run this and vibe check it:

ps -eZ | grep certmaster_t

🎀 ENTRYPOINTS 🎀

The certmaster_t SELinux type can be entered via the certmaster_exec_t file type. that's the doorway, bestie. 🚪✨

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

/usr/bin/certmaster

one path. that's the whole list. lowkey minimalist of them.

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system — like little assigned personalities but for processes, no cap.

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

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

The following process types are defined for certmaster:

  • certmaster_t
Note: semanage permissive -a certmaster_t can be used to make the process type certmaster_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it stops blocking but it's still watching you and taking notes. 😭

🌸 BOOLEANS 🌸

SELinux policy is customizable based on least access required — the "you get nothing extra" philosophy, honestly kind of the main character energy of access control. certmaster policy is extremely flexible and has several booleans that allow you to manipulate the policy and run certmaster 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

the -P is doing the heavy lifting btw — don't skip it or it won't persist. well, the page says -P in every example, so. do that. 🫶

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

The following port types are defined for certmaster:

  • certmaster_port_t

Default Defined Ports:

tcp 51235

that's the port. one port. she's specific and she knows what she wants. ✨

🦋 MANAGED FILES 🦋

The SELinux process type certmaster_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 isn't out here overriding your normal permissions, she's just adding a whole second layer of opinions. 💀

  • certmaster_etc_rw_t
    • /etc/certmaster(/.*)?
  • certmaster_var_lib_t
    • /var/lib/certmaster(/.*)?
  • certmaster_var_run_t
    • /run/certmaster.*
  • 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
  • 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

look at that root_t list — / is literally in there. main character file type fr fr. 👑

💖 FILE CONTEXTS 💖

SELinux requires files to have an extended attribute to define the file type. yes, every file gets a little label sticker. 🏷️

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

🌈 STANDARD FILE CONTEXT

SELinux defines the file context types for the certmaster, 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 certmaster_exec_t '/srv/certmaster/content(/.*)?'
restorecon -R -v /srv/mycertmaster_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. that (/.*)? is not decoration, bestie, it means "this dir and everything under it". 🎀

The following file types are defined for certmaster:

  • certmaster_etc_rw_t
    • Set files with the certmaster_etc_rw_t type, if you want to treat the files as certmaster etc read/write content.
  • certmaster_exec_t
    • Set files with the certmaster_exec_t type, if you want to transition an executable to the certmaster_t domain.
  • certmaster_initrc_exec_t
    • Set files with the certmaster_initrc_exec_t type, if you want to transition an executable to the certmaster_initrc_t domain.
  • certmaster_var_lib_t
    • Set files with the certmaster_var_lib_t type, if you want to store the certmaster files under the /var/lib directory.
  • certmaster_var_log_t
    • Set files with the certmaster_var_log_t type, if you want to treat the data as certmaster var log data, usually stored under the /var/log directory.
  • certmaster_var_run_t
    • Set files with the certmaster_var_run_t type, if you want to store the certmaster 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. tl;dr — chcon is a temporary tattoo, semanage fcontext + restorecon is the real thing. 🙈

⭐ 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.

so many semanage subcommands. she contains multitudes. 💅

🍓 AUTHOR 🍓

This manual page was auto-generated using sepolicy manpage.

a robot wrote this. no cap. and honestly it ate. 🤖✨

🔥 SEE ALSO 🔥

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

and that's the page, bestie — sign-off time: this was certmaster, dated 26-10-06, and yeah, she's still certmaster_selinux(8) the whole way through. periodt. 💜🦋🌸

📦 where this page comes from