winbind_rpcd_selinux(8)

📦 version 38.1.87, in centos-stream 9

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

okay so bestie, this is winbind_rpcd_selinux(8) from the SELinux Policy winbind_rpcd section of the manual. Buckle up, we're getting into mandatory access control and honestly? it's giving secure. 🎀

✨ NAME ✨

winbind_rpcd_selinux — the Security Enhanced Linux Policy for the winbind_rpcd processes. that's the whole vibe. 🦋

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the winbind_rpcd processes via flexible mandatory access control. no cap, it's out here protecting your processes with rules whether they like it or not.

The winbind_rpcd processes execute with the winbind_rpcd_t SELinux type. wanna check if you've got these processes running? just run the ps command with the -Z qualifier, like:

ps -eZ | grep winbind_rpcd_t

literally that simple. 💖

🦋 ENTRYPOINTS 🦋

The winbind_rpcd_t SELinux type can be entered via the winbind_rpcd_exec_t file type. that's the door, iykyk.

The default entrypoint paths for the winbind_rpcd_t domain are:

/usr/libexec/samba/rpcd_lsad, /usr/libexec/samba/samba-dcerpcd

write those down, bestie. 📝

👑 PROCESS TYPES 👑

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

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

Policy governs the access confined processes have to files. The SELinux winbind_rpcd policy is very flexible, allowing users to setup their winbind_rpcd processes in as secure a method as possible. obsessed with the flexibility honestly.

The following process types are defined for winbind_rpcd:

winbind_rpcd_t
Note: semanage permissive -a winbind_rpcd_t can be used to make the process type winbind_rpcd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so it's like, still watching you 👀

🎀 BOOLEANS 🎀

SELinux policy is customizable based on least access required. the winbind_rpcd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run winbind_rpcd with the tightest access possible. main character energy fr.

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

If you want to allow samba to act as the domain controller, add users, groups and change passwords, you must turn on the samba_domain_controller boolean. Disabled by default.

setsebool -P samba_domain_controller 1

If you want to allow samba and winbind-rpcd to share users home directories, you must turn on the samba_enable_home_dirs boolean. Disabled by default.

setsebool -P samba_enable_home_dirs 1

If you want to allow samba to share any file/directory read only, you must turn on the samba_export_all_ro boolean. Disabled by default.

setsebool -P samba_export_all_ro 1

If you want to allow samba to share any file/directory read/write, you must turn on the samba_export_all_rw boolean. Disabled by default.

setsebool -P samba_export_all_rw 1

💜 MANAGED FILES 💜

The SELinux process type winbind_rpcd_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 (yeah, SELinux isn't doing everything, bestie).

  • faillog_t
/var/log/btmp.*
/var/log/faillog.*
/var/log/tallylog.*
/var/run/faillock(/.*)?
  • 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
  • non_security_file_type
  • noxattrfs
all files on file systems which do not support extended attributes
  • samba_bgqd_var_run_t
/var/run/samba-bgqd.pid
  • samba_log_t
/var/log/samba(/.*)?
  • samba_share_t
use this label for random content that will be shared using samba
  • smbd_tmp_t
  • user_home_type
all user home files
  • winbind_rpcd_tmp_t
  • winbind_rpcd_var_run_t
  • winbind_var_run_t
/var/run/winbindd(/.*)?
/var/run/samba/winbindd(/.*)?
/var/lib/samba/winbindd_privileged(/.*)?
/var/cache/samba/winbindd_privileged(/.*)?

🌈 FILE CONTEXTS 🌈

SELinux requires files to have an extended attribute to define the file type. it's like a name tag but for files, slay.

You can see the context of a file using the -Z option to ls.

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the winbind_rpcd. 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 winbind_rpcd_tmp_t '/srv/mywinbind_rpcd_content(/.*)?'
restorecon -R -v /srv/mywinbind_rpcd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 🙈

The following file types are defined for winbind_rpcd:

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

Paths:

/usr/libexec/samba/rpcd_lsad, /usr/libexec/samba/samba-dcerpcd
  • winbind_rpcd_tmp_t — Set files with the winbind_rpcd_tmp_t type, if you want to store winbind rpcd temporary files in the /tmp directories.
  • winbind_rpcd_var_run_t — Set files with the winbind_rpcd_var_run_t type, if you want to store the winbind rpcd 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, i'm begging 😭

🫶 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. for the girlies who prefer clicking 💅

🍓 AUTHOR 🍓

This manual page was auto-generated using sepolicy manpage. so technically not a human author, but it ate regardless.

🔥 SEE ALSO 🔥

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

okay that's the whole page bestie, you're officially a winbind_rpcd SELinux expert now 💖✨

this iconic piece of documentation is from winbind_rpcd and it's dated 26-10-23 — go off, sepolicy manpage generator, you absolute legend 🎀💫

📦 where this page comes from