postfix_...l_selinux(8)

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

💖 postfix_virtual_selinux(8) — the SELinux policy for postfix_virtual, explained bestie-style 💖

Okay so real talk: this is the manual page for postfix_virtual_selinux, the Security Enhanced Linux policy that wraps up the postfix_virtual processes. Think of it as the group chat rules for what those processes are allowed to do, and no cap, it's giving main character energy. 🫶

✨ NAME ✨

postfix_virtual_selinux — Security Enhanced Linux Policy for the postfix_virtual processes. That's literally the whole vibe. 💅

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the postfix_virtual processes via flexible mandatory access control. Lowkey iconic. 💖

The postfix_virtual processes execute with the postfix_virtual_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier. Fr fr, it's that easy.

For example:

ps -eZ | grep postfix_virtual_t

🦋 ENTRYPOINTS 🦋

The postfix_virtual_t SELinux type can be entered via the postfix_virtual_exec_t file type. Slay. ✨

The default entrypoint paths for the postfix_virtual_t domain are literally:

/usr/libexec/postfix/virtual

🎀 PROCESS TYPES 🎀

SELinux defines process types (domains) for each process running on the system. It's a whole thing, but we love it. 💜

You can see the context of a process using the -Z option to ps. That's the move. 👑

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

The following process types are defined for postfix_virtual:

  • postfix_virtual_t
Note: semanage permissive -a postfix_virtual_t can be used to make the process type postfix_virtual_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. So like, you're not off the hook entirely, bestie. 😭

💅 BOOLEANS 💅

SELinux policy is customizable based on least access required. The postfix_virtual policy is extremely flexible and has several booleans that allow you to manipulate the policy and run postfix_virtual with the tightest access possible. We stan a customizable queen. 👑

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 postfix_virtual_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. No skipping that part, iykyk. 💀

  • cifs_t
  • dovecot_spool_t
/var/spool/dovecot(/.*)?
  • ecryptfs_t
/home/[^/]+/.Private(/.*)?
/home/[^/]+/.ecryptfs(/.*)?
  • fusefs_t
/run/user/[0-9]+/gvfs
  • 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_home_rw_t
/root/Maildir(/.*)?
/root/.esmtp_queue(/.*)?
/var/lib/arpwatch/.esmtp_queue(/.*)?
/var/cache/ddclient/.esmtp_queue(/.*)?
/home/[^/]+/.maildir(/.*)?
/home/[^/]+/Maildir(/.*)?
/home/[^/]+/.esmtp_queue(/.*)?
  • nfs_t
  • postfix_spool_t
/var/spool/postfix.*
/var/spool/postfix/defer(/.*)?
/var/spool/postfix/flush(/.*)?
/var/spool/postfix/deferred(/.*)?
/var/spool/postfix/maildrop(/.*)?
  • postfix_var_run_t
/var/spool/postfix/pid/.*
  • postfix_virtual_tmp_t
  • user_home_t
/home/[^/]+/.+
  • user_home_type

all user home files

🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. It's giving ✨metadata✨ but make it security. 💖

You can see the context of a file using the -Z option to ls. Obsessed with how easy that is. 🦋

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the postfix_virtual, 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. Here's the exact move:

semanage fcontext -a -t postfix_virtual_exec_t '/srv/postfix_virtual/content(/.*)?'
restorecon -R -v /srv/mypostfix_virtual_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. Regex girlies rise up. 💅

The following file types are defined for postfix_virtual:

  • postfix_virtual_exec_t — Set files with the postfix_virtual_exec_t type, if you want to transition an executable to the postfix_virtual_t domain.
  • postfix_virtual_tmp_t — Set files with the postfix_virtual_tmp_t type, if you want to store postfix virtual temporary files in the /tmp directories.
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 the restorecon, 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.
  • system-config-selinux is a GUI tool available to customize SELinux policy settings. For the girlies who prefer a lil clicky-clicky. 🎀

👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. The robots did this one, but honestly? They ate. 💅

💜 SEE ALSO 💜

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

And that's the whole page, bestie! Sending you the biggest fairy vibes 🧚✨ — this was the postfix_virtual page from 26-10-06, version postfix_virtual, and you can literally find it under postfix_...l_selinux(8). Go forth and slay your SELinux config. 💖🫶

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