postfix_pipe_selinux(8)

💅 postfix_pipe_selinux — the SELinux glow-up for your postfix_pipe processes 💅

Okay bestie, so this is the manpage for postfix_pipe_selinux, and it's literally the security playbook for the postfix_pipe processes. Security-Enhanced Linux is out here securing the postfix_pipe processes via flexible mandatory access control — no cap, it's giving bodyguard energy.

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✨ NAME ✨

postfix_pipe_selinux — Security Enhanced Linux Policy for the postfix_pipe processes

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🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the postfix_pipe processes via flexible mandatory access control. It's literally the bodyguard of your process world.

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

For example:

ps -eZ | grep postfix_pipe_t

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🎀 ENTRYPOINTS 🎀

The postfix_pipe_t SELinux type can be entered via the postfix_pipe_exec_t file type.

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

/usr/libexec/postfix/pipe

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

The following process types are defined for postfix_pipe:

• postfix_pipe_t

Note: semanage permissive -a postfix_pipe_t can be used to make the process type postfix_pipe_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

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🧚 BOOLEANS 🧚

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

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

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👑 MANAGED FILES 👑

The SELinux process type postfix_pipe_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.

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(/.*)?

postfix_pipe_tmp_t

(no default paths listed, bestie — it's just vibes)

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/.*

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🌈 FILE CONTEXTS 🌈

SELinux requires files to have an extended attribute to define the file type. It's literally how it recognizes its people.

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the postfix_pipe, 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 postfix_pipe_exec_t '/srv/postfix_pipe/content(/.*)?'
restorecon -R -v /srv/mypostfix_pipe_content

Note: SELinux often uses regular expressions to specify labels that match multiple files.

The following file types are defined for postfix_pipe:

• postfix_pipe_exec_t — Set files with the postfix_pipe_exec_t type, if you want to transition an executable to the postfix_pipe_t domain.
• postfix_pipe_tmp_t — Set files with the postfix_pipe_tmp_t type, if you want to store postfix pipe 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.

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💜 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 when you want to click things instead of type them, and honestly? Valid.

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🫶 AUTHOR 🫶

This manual page was auto-generated using sepolicy manpage. So yeah, a robot wrote it originally, and now I'm giving it the group-chat remix. 💅

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🍓 SEE ALSO 🍓

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

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Okay bestie, that's the whole thing — every option, every path, every boolean, all present and accounted for. No details were harmed in the making of this glow-up. ✨

This masterpiece of a manual page is from the postfix_pipe package, dated 26-10-06, and it's the postfix_pipe_selinux(8) page you'll be coming back to every time you need to remember which boolean does what. Slay. 🎀